Extensions are like apps for your browser.
They add features to Firefox to make browsing faster, smarter, or just plain fun.
New Tab Override (WebExtension)
New Tab Override brings back the ability to change the page which is shown when opening a new tab.
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Gesturefy
Customizable mouse gesture add-on, which supports over 60 different commands and additional features like rocker and wheel gestures.
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YouTube in HD (720p, 1080p, 1440p, 2160p)
Watch YouTube in the full-HD quality or the highest available one
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Context Search
Search selected text using your preferred search engines. Right-click or Shift-click on selected text to respectively launch the context menu or the grid of icons. You can also perform searches using keywords in the url address bar.
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Enhancer for YouTube™
Tons of features to improve your user experience on YouTube™.
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SoundFixer
Lets you fix annoying sound problems in YouTube videos and such. Like audio in one channel only, too quiet or too loud. (Unfortunately, doesn't work on many other websites because of cross-domain issues — but it does work on YouTube.com!)
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YouTube High Definition
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.
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Video Speed Controller
Speed up, slow down, advance and rewind any HTML5 video with quick shortcuts.
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Wikiwand: Wikipedia Modernized
Good old Wikipedia gets a great new look
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Wikipedia Peek
Shows previews of linked articles on Wikipedia pages.
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Wikipedia Context Menu Search
Search for highlighted text on Wikipedia via the context menu.
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Random Unusual Wikipedia new tab
Redirects to a random unusual Wikipedia page when you open a new tab, because when you're opening a new tab you're looking for a distraction and that distraction might as well be a weird fact. Or show random Cognitive Bias, or Philosophical concept.
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Tree Style Tab
Show tabs like a tree.
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New Tab Override (WebExtension)
New Tab Override brings back the ability to change the page which is shown when opening a new tab.
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Tab Auto Refresh
Automatically refresh tabs based on custom time intervals
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OneTab
OneTab - Too many tabs? Convert tabs to a list and reduce browser memory
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