Dark theme for every website. Care your eyes, use Dark Reader for night and daily browsing.
Spoofs User-Agent strings of your browser with a new one globally, randomly or per hostname
An easy-to-use font inspector to get CSS styles of the selected element
Quickly and easily switch between popular user-agent strings.
The "NewScrollbars"-extension replaces default scrollbars of Firefox and Thunderbird with colorized ones (partly) known from "Noia themes". [ not compatible with Firefox / Thunderbird 57+ ]
'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
⭐ Highest rated! ⭐ Best User Interface! ⭐ Automatically reload and refresh web pages in simplest way.
- Monitor live requests - Edit headers on live requests - Cancel live requests - Redirect live requests Click the blue cloud in the toolbar to start tampering. When you're done, click it again to stop.
Enhance code browsing on GitHub: code search, instant documentation tooltips, and jump-to-definition links for code on GitHub.
Form autofill on steroids.