Explore powerful tools and features to customize Firefox and make the browser all your own.
Tons of features to improve your user experience on YouTube™.
Get free text of research papers as you browse, using Unpaywall's index of ten million legal, open-access articles.
Watch YouTube in the full-HD quality or the highest available one
Expand your email area by blocking and removing ads on the right hand side of the screen when using Gmail, Hotmail, Outlook.com and Yahoo Mail.
Squared tabs, application menu, add-on bar, small button view and many more 'old' features for 'Firefox 29-56', not for Firefox 57+! Latest builds on Github! AMO is dead.
Tab Groups are an easy way to organize a lot of tabs. You can visually group related tabs, switch between groups, and quickly search through all of your tabs to switch to a specific one.
Does everything for an HTML table: Copy (table/row/column/cell), Sort (multi-column), Search (regex, range operations ...), Filter, Chart, Statistics, Rearrange, Combine/Compare. To use: Right click in a real HTML table for the "tabletools2" option.
Add-on to display GitHub code in tree format
Translate selected text with Google's cloud translation service on the same webpage you are visiting.
Translate whole page using Google Translate
Switch website you want to dark mode. Dark mode will help devices save battery and reduces strain on your eyes.