An easy-to-use font inspector to get CSS styles of the selected element
FoxyProxy is an advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. For a simpler tool and less advanced configuration options, please use FoxyProxy Basic.
An easy-to-use tab reloader with custom reloading time settings for individual tabs
Create a QR code of the selected text, current url or hyperlink. Also possible to create a QR Code from free text within Firefox. Now with UTF8 support.
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.
'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions. Beta builds on versions page!
Add-on to display GitHub code in tree format
The "NewScrollbars"-extension replaces default scrollbars of Firefox and Thunderbird with colorized ones (partly) known from "Noia themes". [ not compatible with Firefox / Thunderbird 57+ ]
Redesign the web with Stylus, a user styles manager. Stylus allows you to easily install themes and skins for many popular sites.
Get unique relative xpath, absolute xpath & CSS selectors. Edit, inspect & verify XPath & CSS selectors in devtools panel itself. xpath add-on for firefox.
Modern Open-Source Web Browser Macro Recorder and Selenium IDE. Use it for general web automation, web testing, form filling & web scraping. Kantu's main focus is ease of use, recording and reliable playback for all kinds of browser automation tasks.
* Not Compatible with FF web extensions. No longer developed* Rotates complete browser profiles ( from real browsers / devices ) at a user defined time interval. It includes many extra privacy enhancing options