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YouTube™ Video and Audio Downloader

Downloads YouTube videos in all available formats (FLV, MP4, WebM, and 3GP) with video quality of your choice. It also contains a pure JavaScript library to extract the ORIGINAL audio file embedded in video files.

Rated 4 out of 5 stars (402)
52,432 weekly downloads

YouTube Flash Player

A very lightweight add-on that allows you to watch YouTube™ videos using Flash® Player instead of the default HTML5 player. The Flash® Player will consume less material resources (CPU, RAM) if your PC doesn't easily support HTML5 videos. Try it!

Rated 5 out of 5 stars (78)
32,053 weekly downloads

YouTube High Definition Featured

YouTube High Definition is a powerful tool that will let you automatically play all YouTube videos in HD (High Definition), turn off annotations, change video player size, auto stop videos, auto mute videos, control embedded videos and much more.

Rated 5 out of 5 stars (228)
20,182 weekly downloads

Turbo Download Manager Featured

a download manager with multi-threading support

Rated 4 out of 5 stars (66)
9,630 weekly downloads

Enhancer for YouTube™ Compatible with Firefox 57+ Featured

One of the best extensions for YouTube™. All the features you need to make YouTube™ more awesome!

Rated 5 out of 5 stars (76)
6,906 weekly downloads

Video Background Play Fix Compatible with Firefox 57+

Some sites may not work with Firefox for Android video background play feature. This add-on provides a quick fix by blocking the Page Visibility API and the Fullscreen API.

Rated 4 out of 5 stars (38)
6,134 weekly downloads

YouTube™ Flash-HTML5 Compatible with Firefox 57+ Featured

Play YouTube™ Videos in Flash or HTML5 Player

Rated 4 out of 5 stars (40)
6,100 weekly downloads

YouTube Enhancer Plus Requires Restart Featured

Improve your watching experience! Ad Blocker, Autoplay Manager, Auto HD, Auto Replay, Cinema Mode, and more.

Rated 5 out of 5 stars (117)
5,359 weekly downloads

Google™ Translator Featured

Google™ Translator is a handy multi-language translator built on top of Google Translate. It gives you Google Translate UI feel right on your Firefox toolbar.

Rated 4 out of 5 stars (151)
4,856 weekly downloads

Fasterfox Requires Restart

STILL WORKS FLAWLESSLY AS OF 12-5-2016
The One; The Original Fasterfox Gives performance & network tweaks for Firefox. Fasterfox makes your browsing so much faster!
Make your Sites Faster than a Fox with Fasterfox for FireFox!

Rated 4 out of 5 stars (81)
4,097 weekly downloads

YouTube Video Downloader - For Context Menu

Right click YouTube video links on any websites, download it from context menu. Multi formats(mp4 flv 3gp), easy to use and fast to response.

Rated 3 out of 5 stars (45)
3,558 weekly downloads

Free Flash, Unity3D and html5 games

Best Unity3D, Flash and html5 games. This add-on opens game panel with a single click. New games every day! Very easy to use!

Rated 5 out of 5 stars (2)
2,850 weekly downloads

Open in VLC media player Compatible with Firefox 57+

Adds a context menu item to send audio/video streams directly to VLC media player

Rated 3 out of 5 stars (1)
2,814 weekly downloads

YouTube No Buffer (Stop Autoplaying) Featured

A bulletproof approach to prevent YouTube from buffering videos

Rated 4 out of 5 stars (27)
2,472 weekly downloads

YouTube to MP3 Converter Compatible with Firefox 57+

YouTube to MP3 Converter and also YouTube to MP4, M4A and WEBM Downloader.
YouTube MP3 provides Audio MP3 up to 320 kbps, M4A up to 128kbps, Video MP4 and WEBM up to Maximum Available. Highest Download Quality Available. No Limits. Fast Download.

Rated 5 out of 5 stars (57)
2,197 weekly downloads

Messenger for Google™ Hangouts Compatible with Firefox 57+

Easily connect with friends and family while you browse internet. This add-on brings conversations to life with photos, emoji, and even group video calls!

Rated 4 out of 5 stars (20)
2,016 weekly downloads

Youtube Unblock VPN

Youtube Unblock VPN is number one tool for unblocking youtube and any other web site!

Rated 4 out of 5 stars (7)
1,924 weekly downloads

Youtube Video Download Compatible with Firefox 57+

1. Install Extension
2. Play youtube video in your browser
3. Click the KV icon then click respective links to download
The most popular Keepvid.site website's Youtube Video Download Extension

Rated 4 out of 5 stars (20)
1,801 weekly downloads

YouTube HD Plus

Automatically play YouTube™ videos in HD or any other preferred format, and disable autoplay for videos loaded in background tabs.

Rated 5 out of 5 stars (25)
1,789 weekly downloads

Unblock Youku

Helps users access their web services while travelling outside mainland China.

Rated 4 out of 5 stars (48)
1,548 weekly downloads