Games & Entertainment
Tons of features to improve your user experience on YouTube™.
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!
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.
Turbo Download Manager Featured
a download manager with multi-threading support
Adds a context menu item to send audio/video streams directly to VLC media player
Play YouTube™ Videos in Flash or HTML5 Player
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.
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!
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.
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.
Best Unity3D, Flash and html5 games. This add-on opens game panel with a single click. New games every day! Very easy to use!
YouTube Enhancer Plus Requires Restart Featured
Improve your watching experience! Ad Blocker, Autoplay Manager, Auto HD, Auto Replay, Cinema Mode, and more.
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
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.
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!
Automatically play YouTube™ videos in HD or any other preferred format, and disable autoplay for videos loaded in background tabs.
Youtube Unblock VPN is number one tool for unblocking youtube and any other web site!
Youtube downloader pro Requires Restart
The simplest YouTube Video Downloader for all YouTube videos. No ads, no popups. Just one click.