- Youtube Video Downloader Mozilla Plugin
- Youtube Video Downloader Mozilla Plugin
- Streaming Video Downloader Mozilla Plugin
- Video Downloader Mozilla Firefox Plugin
- Download Mozilla
- Fast Video Downloader Mozilla Plugin
- Free Video Downloader For Firefox
Critical Issues with Flash Video Downloader Crashing Firefox Nightly on Startup after XPI Self-Modification for Malware Injection
- Flash Video Downloader (FVD) is updating its own XPI to version v16.3.8 unreviewed by Mozilla, circumventing Mozilla add-on review process (it seems for many releases over the past 6 months, over which period it completely stopped even attempting to make releases on addons.mozillla.org), hacking itself, to inject CSP rules and scripts into its manifest for malware domain mdn2015x4.com.
- Flash Video Downloader (FVD) v16.3.8 installed in this way is causing Firefox Nightly to crash every time on startup.
- Every time I launched Firefox I ended up with another FVD_Downloader_Module.exe process spawned on Firefox startup, even when not using FVD, and those processes remain, even after closing Firefox (they may or may not remain or continue to pile up in cases when Firefox does not crash), so that I ended up with 12+ (and growing) number of FVD_Downloader_Module.exe processes running forever in the background.
Steps to Reproduce
- Install Flash Video Downloader (FVD) (https://addons.mozilla.org/en-US/firefox/addon/flash-video-downloader/) with Firefox Nightly for Windows 10 x64. Backup the .xpi file located at the following path (for comparision, as it modifies/replaces its own XPI to unapproved, unstable and seemingly malware infected version):
<ProfileFolder>/extensions/[email protected]
- Go to a video page (such as https://www.youtube.com/watch?v=-GyOZ5-KrSs) and click FVD toolbar button, and you will see that for most download options a 'Convert' button is shown instead of 'Download'
- Click the Convert button, and an overlay is shown with a 'Download FVD Downloader Module' prompt button:
3B. Alternatively, you can go to the Settings page for the FVD extension, and you will see the same 'Download FVD Downloader Module' button there too:
Features included in FVD free youtube video downloader (browser plugin) Multi Browser support, has versions for Chrome, Firefox, IE, Safari and mobile. Supports many video streaming websites; several download video links are presented depending on video quality versions stored on youtube. Adfree video downloader, spy free video downloading program. Video DownloadHelper is the most complete tool to extract videos and image files from Web sites and save them to your hard drive. Just surf the Web as you are used to, when DownloadHelper detects it can do something for you, the toolbar icon highlights and a menu allows you to download files by simply clicking an item. Fast Video Downloader is a Chrome plugin which is offered by Desktop Tools. It allows you to customize the configuration of the videos to an extent and makes it extremely easy to download the videos by simply clicking on the download button on the YouTube page.
- Click the 'Download FVD Downloader Module' button which takes to page (http://fvdmedia.com/installation-guide-windows/) which downloads and prompts user to install (and add anti-virus exception for)
'FVD_Downloader_Module.exe', like shown below: - Install 'FVD_Downloader_Module.exe' and restart Firefox Nightly, which results in installing Windows program 'FVD Downloader Module' (v1.0.8 in my case) to file path:
C:Users<UserName>AppDataRoamingFVD Downloader ModuleFVD_Downloader_Module.exe
- You will see that the extension XPI file ([email protected]) has been updated to
v16.3.8 (or a much newer version than v16.2.9, from 6 months ago, which is the latest version available at https://addons.mozilla.org/en-US/firefox/addon/flash-video-downloader/). - Firefox Nightly then crashes about 2 seconds after launched, every single time it is launched. This occurs before could even attempt to view Console or perform any other kind of debugging. Also, the FVD extension update does not even show up under about:addons > gear icon > View Recent Updates. All of this made it very difficult for users to determine the cause of Firefox crashing on startup.
- You can open the XPI and view its manifest.json file to confirm the version it was updated to (since it crashes Firefox Nightly on startup for me preventing inspecting its version on about:Addons) to compare differences in xpi.
- If you don't see that the XPI was updated yet (from latest release v16.2.9 on addons.mozilla.org to v16.3.8 like in my case), you may need to restart your PC or wait a while for it to perform an auto-update.
- If for some reason you don't see the same XPI version (v16.3.8) or don't see crashes on startup, this could be due to what version of the 'FVD Downloader Module' was installed (1.0.8 in my case). However, most FVD users will have the 'Binary Component' installed long ago, like in my case, so that the majority of users will encounter the same issues as myself.
- You can disable the Add-on (once the .exe updated to v16.3.8 or you manually installed that version as provided in the .7z archive download link), startup Firefox Nightly, then manually enable the addon. Within 2 seconds of it being enabled, Firefox Nightly crashes (even when no other add-ons are enabled).
I confirmed that FVD is the source of these crashes on startups by removing all other add-ons and starting Firefox with a new clean profile with FVD installed and seeing that it causes Firefox Nightly to crash on startup or when the addon is enabled.
Direct Downloaded of Unauthorized, Crash Inducing, Possibly Malware Infected XPI
You can download this .7z archive which includes v16.3.8 (unauthorized, possibly malware version installed by FVD's binary component which crashes Firefox) of [email protected].
This also includes the older v16.2.9 public Mozilla Addons release and the manifest.json file from each of those XPIs, for easy comparison.
You can manually install the XPI from the VirusOrCrashesFirefox-v16.3.8/ folder in that .7z to reproduce these issues or inspect that XPI without following all of the above steps, or if unable to reproduce via the above steps.
This also includes the older v16.2.9 public Mozilla Addons release and the manifest.json file from each of those XPIs, for easy comparison.
You can manually install the XPI from the VirusOrCrashesFirefox-v16.3.8/ folder in that .7z to reproduce these issues or inspect that XPI without following all of the above steps, or if unable to reproduce via the above steps.
Crash Details and Failed Add-on Abuse & Crash Reports
You can review to the crash report I submitted at 4/28/2019 at 6:18pm PST here for when FVD v16.3.8 causes Firefox to crash on startup.
According to that crash report, this may relate to Mozilla bug 1547596 'Crash in mozilla::DataStorage::Remove'.
I submitted a report via 'Report this add-on for abuse' button on the Add-on page at https://addons.mozilla.org/en-US/firefox/addon/flash-video-downloader/ around on 4/28/2019 around 7:20pm PST.
You can also find an Add-on review describing this issue.
Devexpress print pdf. I provided contact info in those reports but haven't received any responses since submitted on 4/28/2018 for a critical issue that has been causing crashes on startup in addition to its clear violation of Mozilla add-on review policy and malware-like behavior. Also, I haven't found any recent Mozilla bug reports related to Flash Video Downloader result from that, which is why I am submitting this bug report here with further details.
Suggested Actions
I would suggest:
- Investigating for abuse (or suggesting the abuse report I'd filed be investigated/prioritized, as it seems like it wasn't acted on)
- Investigating whether FVD is prompting install of malware, violating Mozilla policies with modifying its own XPI to unreviewed versions.
- Contacting the add-on developer about how should submit versions for review via addons.mozilla.org instead of via their new .exe distribution workaround (which seems has been used exclusively for distributing .xpi updates for the past 6 months).
- Ensuring this add-on no longer causes crashes on startup with Firefox Nightly or other Firefox releases (which may not have any fixes available for a while to them, even if fixed in Firefox Nightly)
- Possibly blacklisting FVD version 16.3.8 or other unreviewed or crash-inducing or malware-like versions of FVD.
- Investigating whether the newer XPI versions its exe is installing, as well as even older versions, are exhibiting malware-like behavior with mdn2015x4.com scripts or via any other means.
Concerns
FVD has circumvented the Mozilla Addon review process, and is modifying/replacing its own .xpi file with versions not reviewed by Mozilla, which adds CSP rules and scripts from malware domain
mdn2015x4.com.
It has done so by prompting users to install an .exe as is required for even basic usage for FVD prompting users to install when they attempt to download many/most videos, as well as even potentially infecting the browser itself, with the XPI indirectly modifying its own .XPI file.
The result is, at best, instability causing Firefox Nightly to crash every time on startup (in a way that makes it very difficult to determine the cause and disable the extension, as it doesn't even appear under 'Recently Updated Extensions'). At worst, this may be installing malware into the browser.
mdn2015x4.com.
It has done so by prompting users to install an .exe as is required for even basic usage for FVD prompting users to install when they attempt to download many/most videos, as well as even potentially infecting the browser itself, with the XPI indirectly modifying its own .XPI file.
The result is, at best, instability causing Firefox Nightly to crash every time on startup (in a way that makes it very difficult to determine the cause and disable the extension, as it doesn't even appear under 'Recently Updated Extensions'). At worst, this may be installing malware into the browser.
Major Differences with Unreviewed FVD v16.3.8 XPI vs v16.2.9 (Injected Possible Malware Domain, CSP, and Scripts for All Pages)
After comparing the manifest.json files (as included in the linked to .7z download) for both the Mozilla reviewed and unreviewed/stable versions of the XPI files for FVD, I noticed the following following are the key suspicious additions to manifest.json for v16.3.8 compared to v16.2.9.
- Added a CSP Content Security Policy for all pages for mdn2015x4.com, which appears to be a malware domain:
'content_security_policy': 'script-src 'self' *.mdn2015x4.com; object-src 'self',
- Injects 2 new scripts which run for all pages (and which are new .js files not found in the version reviewed by Mozilla) including:
- Adds a script from malware domain mdn2015x4.com to popup.html
My Configuration
- Firefox Nightly 68.0a1 (2019-04-28) (64-bit)
- Windows 10 Pro x64
Youtube Video Downloader Mozilla Plugin
The easiest way to download YouTube videos is to use a YouTube download plugin for Firefox, Safari or Chrome, so that you can stream and download the video in your browser directly. There are many types of YouTube download addons throughout the Internet, but which one is the best? No worry! Below we will show you the top 20 YouTube downloader plugin to download videos from YouTube and other sites free and fast.
If you are looking for best YouTube downloader for PC, iTube HD Video Downloader is the highly recommended YouTube downloader plugin add-on for downloading videos in the browser. After installing this YouTube download plugin, it enables you a Download button on Chrome, Firefox, Safari or Internet Explorer, allowing you to download videos in 1 click.
iTube HD Video Downloader - Best YouTube Download Plugin in 1 Click
- Download videos from YouTube, Vimeo, Facebook and 10,000+ sites.
- Batch download videos and download all videos from YouTube playlist.
- Convert videos to other video/audio formats and to mobile devices.
- Transfer the downloaded videos to iPhone and Android devices.
- Equipped with a video recorder which allows to capture any online video.
- Private Mode to fully protect your video downloading information with a password.
Part 1. Best 5 YouTube Downloader Plugins for Chrome
Video Downloader Professional
Video Downloader Professional is a free plugin for Chrome browser, and it helps you to download videos from YouTube or other video sharing sites easily. The plugin is available in Google Web Store.
Pros
- Simple and easy interface.
- Supports more than other
- Really quick to install being a plugin
- Ability to play videos via Chromecast directly on your TV
- Ability to add videos easily to a video list
- Quick downloading of videos.
- Extension comes free of cost.
Cons
- The plugin doesn't have stable downloading speed
- There is no way to choose the download quality.
Fast Video Downloader
Fast Video Downloader is a Chrome plugin which is offered by Desktop Tools. It allows you to customize the configuration of the videos to an extent and makes it extremely easy to download the videos by simply clicking on the download button on the YouTube page.
Pros
- Downloads 3D/4K videos
- One click to install the plugin
- Ability to choose the video quality for downloading
- Download videos from popular video sharing sites
- Allows customization of videos & many formats
Cons
- Chrome browser may become unstable after installing this plugin
- This plugin doesn't support to download videos from YouTube
vGet Extension
vGet Extention for Chrome is developed by Manuel Braun, and it's a free plugin for Chrome browser. With the help of this plugin, you can download videos from YouTube easily.
Pros
- This plugin the free for charge
- It has a very easy-to-use interface
- Extension loaded on demand, leading to less obtrusion.
- Ability to play videos directly on Smart TV.
Cons
- May cause chrome to crash if too many videos are queued at once for download
- This plugin doesn't support streaming video websites
- Flash videos are not supported
- Cannot download YouTube videos
GetThemAll Video Downloader
GetThemAll Video Downloader is a free Chrome plugin which allows you to download videos from YouTube and other video sharing sites, and it enables you to get the work done with ease.
Pros
- Plugin automatically finds the videos on the page to download
- Comes free of cost
- Allows for a large number of downloads to be put in queues
- Can download videos from different major video sites
- Ability to choose video quality
Cons
- Downloads may take place at reduced speeds at times
- Can be obtrusive at times
Videograbber
Videograbber by Ideawide.com is a free Chrome extension which lets you download YouTube videos effortlessly with easy-to-use interface. This plugin is optimized for Chrome and it's totally free to download and use.
Youtube Video Downloader Mozilla Plugin
Pros
- Quick and easy downloading options
- Allows configuration of video downloads
- Can grab videos from the popular video sharing sites
- Can play movies with subtitles
- Can relate same videos in different sites to save download and bandwidth
Cons
- Does not have a large user base like other extensions
- Can be slow to run
Part 2. Top 5 YouTube Downloader Plugins for Firefox
YouTube Audio & Video Downloader
YouTube Audio & Video Downloader allows you to download videos from YouTube on Firefox browser. The download settings is customizable so that you can handle the extension easily.
Pros Descargar driver hp deskjet 2050 para windows 7 32 bits.
- Clean user interface
- Find the videos you need instantly
- Good for downloading audio and video
- Can download videos from the popular video sites
Cons
- The program gets stuck when downloading 1080p videos
- Limited Choice for the output formats
1-Click YouTube Video Downloader
1-Click YouTube Video Downloader is one of the quickest and easiest way to download YouTube videos. It simply adds a download button and lets you customize your download.
Pros
- Built-in video player
- This is a totally free plugin for Firefox
- Simple and easy-to-use interface
- Ability to download videos from over 50 sites
- The installation of this plugin is very easy to be done
Cons
- The downloading with this plugin may lead to the crash of Firefox browser
Easy YouTube Video Downloader Express
Regarded as a great video downloader plugin for Firefox, this plugin is easy to use, and it can help you to download videos from YouTube to your local hard drive with simple clicks.
Pros
- Clean interface
- Extensive range of download quality options
- Can download both as MP3 or MP4 from the videos
Cons
- If too many videos are waiting in queue for download, the browser may get crashed
- The streaming option is not available
Video DownloadHelper
This plugin for Firefox can help you to download videos from YouTube and other video sharing sites, and it will save the downloaded videos in your local hard drive, which will be very helpful for you to get the videos you need.
Pros
- Very easy to use interface
- Allows many customization options in terms of formats
- Ability to convert the downloaded videos
- Can download from most sites
- Limited choice of HD options
Cons
- At times this plugin lags on Firefox browser
- This plugin doesn't allow you to choose video quality before downloading
- The time of downloading process is long
- This plugin only gets web videos
Download YouTube Videos as MP4
This plugin for Firefox is a simple but powerful link downloader for YouTube fans. After installing this plugin in Firefox, you only need to paste the URL in Firefox, and then the downloader will automatically download the video from YouTube.
Pros
- This plugin is totally free of charge
- The plugin is easy to install and use
- The plugin gets and downloads the video from YouTube dierctly
Cons
- The plugin downloads videos in limited file types
- This plugin cannot stream videos
- This plugin only download YouTube videos
Part 3. Top 5 Youtube Downloader Plugins for IE
Free Video Downloader
Free Video Downloader is a small and free video downloader plugin for Internet Explorer, and it allows you to download videos with fast speed and easy process. With the help of this downloader, you are able to download videos from YouTube easily.
Pros
- This plugin is totally free to use
- It allows you to choose different video file types for output
- This plugin only needs little storage space for installation
- This plugin can download videos from popular video sharing sites
Cons
- It may become unstable when downloading videos
- It can't help to convert videos after download
DVDVideoSoft
Besides the desktop downloader, DVDVideoSoft also has downloader plugins for IE and Firefox. The plugin can help you to download videos from YouTube, and convert the downloaded videos to MP3 audio files.
Pros
- This plugin supports all kinds of video file types
- It allows you to download HD videos from YouTube
- It is fully compatible with IE and Firefox
- It can download YouTube playlist with one click
- This plugin doesn't have ads or bloatware
- It fully supports video conversion after download
Cons
- When downloading 1080p videos, the plugin may malfunction
- It doesn't have streaming features
- At times it doesn't recognize certain videos
Save Video Plugin
This plugin is a compact programs which enables you to download and convert videos from YouTube and other video sharing sites. The program can save YouTube videos in several video formats with no efforts.
Pros
- This plugin is one of the best video downloaders for Internet Explorer
- It offers multiple video formats for conversion
- It can download videos from all the popular video sharing sites
- It has a built-in video player for the offline video playback
Cons
- This plugin is not free
- It only works with IE browser
DownloadHelper for Internet Explorer
This is also a powerful YouTube downloader plugin for Internet Explorer. This plugin can help you to download videos from many video sharing sites, and it saves the downloaded videos on your local hard drive easily.
Pros
- Trustworthy and without adware or spyware
- It's totally free to download and use
- It enables you to download videos from YouTube and other popular video sharing sites
Cons
- The UI of this plugin is very user-friendly
- It only has limited choices for video file types
- The plugin only works with Internet Explorer
Freemake Youtube Downloader
Freemake YouTube Downloader is a video downloader program which contains a plugin for YouTube, and it allows you to download videos with one click easily. After installing the program, you can find the Download Video button when watching videos.
Pros
- This downloader has a good reputation among the users
- It can help you to locate the videos you need with ease
- The user interface of this deownloader is very clean
- The multi-tasking feature is very powerful
- This downloader is one of the best downloader for Internet Explorer
- It allows you to download videos with one click
Cons
- This plugin may lead to the crash of Internet Explorer when downloading many videos
- This plugin only works with the Freemake Video Downloader program
Part 4. Top 5 Youtube Downloader Plugins for All Browsers
Easy YouTube Video Downloader
This is an easy to use YouTube downloader plugin and it has high speeds. You will have all the benefits to reap by choosing to use the plugin for downloading your YouTube videos. It is a multi-platform downloader that can download videos from more than one online site in a hassle-free manner. When using Easy YouTube Video Downloader, you will be able to download any type of files both audio and video. This becomes even more beneficial since you will be able to access them offline without any requirement for internet connection. It offers more than one selections for video quality in high definition and high quality modes which is a unique feature.
Downloads for Easy YouTube Video Downloader are instant and direct at very high speeds. There are many formats that can be used for downloading YouTube files that include MP3, FLV, MP4 and 3GP. You will be more than happy to learn that this downloader is free and safe from attacks by adware or malware. Easy YouTube Video Downloader is supported by Opera and Google Chrome browsers.
FastestTube
This is one of the few YouTube downloader plugins that is supported by many browsers that include Internet Explorer, Firefox, Google Chrome, Safari and Opera. If your computer is not installed with Kwizzu Fastesttube, it will take you very short period to install which is mostly accomplished with a single click. The fact that it is supported by multiple browsers means that you will enjoy the freedom of opening YouTube videos you want and in different platforms. Fastesttube allows the user to select the quality of the video to download as well as format so you will be a boss of yourself in many ways.
FLV and MP4 are the common formats that you can use with Fastesttube whenever downloading YouTube files since they are compatible with many video players. Preferably, Fastesttube comes out as an ideal way for downloading YouTube videos over any other plugin that you will come across in the market. Don't be bothered again by unsatisfactory user experience since Fastesttube is the best when it comes to using it for downloading YouTube videos. You will have to forget about rebooting your PC or even copying and pasting the URL link for the download to be successful. It is as easy as just a single click on the “download” button.
SaveFrom.net
This is the right YouTube plugin to use in downloading videos from multiple online sites but after it has been installed to your computer. This YouTube downloader plugin supports multiple browsers that include Google Chrome, Mozilla Firefox, Opera and Safari so be sure to choose your favorite. Sometimes, SaveFrom.net might not be reliable as it indicates traffic from unexpected sites which will do more harm than good. That will be very dangerous in case the plugin will depend on a third-party website to function.
Despite that, there are loads of benefits to enjoy with SaveFrom.net which should not be overlooked. Batch downloading is one such benefit and you will be able to have more than one videos downloaded at the same time and from multiple sites. That definitely saves time and energy that could have been consumed in downloading a video at a time. You also have to count on the high speeds that SaveFrom.net comes with. It means you will have completed all downloads within a record time more than you could have envisaged.
Streaming Video Downloader Mozilla Plugin
VideoGrabber
FLV is the standard format that many online sites use to store YouTube files and it will be compatible with VideoGrabber as well. With Google Chrome, you will have it easy and free downloading YouTube files from any website that you feel like. Chrome is the common browser that VideoGrabber uses but you don't have to ignore others. Actually, Google Chrome is the fashionable browser in the market today which is why VideoGrabber associates with its success very much. There are two main methods that VideoGrabber uses to download YouTube videos online.
One, there is the free download FLV video in Chrome and it is advantageous in that no incompatibility issues will arise. It will stand out from the rest because of the additional features that make VideoGrabber not only a downloading plugin but one that can deliver more. There is screen recorder as well as video conversion which make it possible to extract audio from video files. It’s easy to use this method by launching the VideoGrabber, open your favorite video then copy and paste the URL link to the downloader.
Video Downloader Mozilla Firefox Plugin
The second method for VideoGrabber is ultimate YouTube downloader which is well compatible with Chrome. As long as a video is on FLV format, this method will download it regardless of the site it is found. All its functions have to be enabled before you can kick start the downloading process. The two methods prove one important thing that VideoGrabber is a steady platform for downloading YouTube videos on Chrome. You will find that Chrome crashes down more often and has low download speeds when used with any other downloader. That is not the case with VideoGrabber.
Download Mozilla
SmartVideo
This YouTube downloader plugin is supported by Mozilla Firefox, Opera, Google Chrome and Safari browsers. Surely, your options will be wide open when looking for the ideal browser to use in downloading YouTube videos with this plugin. SmartVideo is assured to offer you the best and unrivalled experience in downloading YouTube files since you will have control over their buffering. Furthermore, you will enjoy uninterrupted play of your downloaded videos while the control over size and quality of videos will be squarely on your hands.
There are many notable features for SmartVideo which you should look out for in making your final selection. It can work with every embedded YouTube video and you can customize them for free. With SmartVideo, it is very much possible to know when to play your video and when not to play. This is because it is capable of calculating such timings once you hover the mouse on the videos. Very few YouTube download plugins have this feature and SmartVideo is truly an exception.
Fast Video Downloader Mozilla Plugin
Comparison of YouTube Video Downloader Plugins
Now that you have the necessary information concerning the top five YouTube download plugins, make sure you have chosen the right ones. Don’t entertain assumptions because they will just end up frustrating you.
Free Video Downloader For Firefox
Features | iTube HD Video Downloader | Easy YouTube Video Downloader | Fastesttube | SaveFrom.net | VideoGrabber | SmartVideo |
---|---|---|---|---|---|---|
All Browser Support | ||||||
Multiple Video Format | --- | |||||
Broad Site Support | --- | --- | ||||
Batch Download | --- | |||||
Download YouTube Playlist | --- | --- | --- | --- | --- | |
Convert Videos to Other Format | --- | --- | --- | --- | --- |