Select text and search from the context menu or a tiled popup using any of your installed search engines. Add new search engines with a right-click, edit favicons and query strings. POST compatible, simple UI, highly configurable. For FF 57+
Get international weather forecasts from AccuWeather.com and display them in any toolbar or statusbar with this highly customizable and unobtrusive extension.
The fastest and safest web browsing experience.
Download YouTube videos in all available formats and extract the original audio files
Tons of features to improve your user experience on YouTube™.
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!)
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.
Speed up, slow down, advance and rewind any HTML5 video with quick shortcuts.
Good old Wikipedia gets a great new look
Shows previews of linked articles on Wikipedia pages.
Search for highlighted text on Wikipedia via the context menu.
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.
Show tabs like a tree.
New Tab Override brings back the ability to change the page which is shown when opening a new tab.
Automatically refresh tabs based on custom time intervals
OneTab - Too many tabs? Convert tabs to a list and reduce browser memory