An easy-to-use font inspector to get CSS styles of the selected element
The Ultimate online investigation tool! See detailed information about every IP Address, Domain Name and Provider.
Spoofs User-Agent strings of your browser with a new one globally, randomly or per hostname
An easy-to-use tab reloader with custom reloading time settings for individual tabs
'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!
View source code of Firefox add-ons and Chrome extensions (crx/nex/xpi) from addons.mozilla.org, the Chrome Webstore and elsewhere.
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+ ]
Cookie-Editor lets you efficiently create, edit and delete a cookie for the current tab. Perfect for developing, quickly testing or even manually managing your cookies for your privacy. Also supports Firefox for Android.
Extension de partage d'écran sur l'application JITSI utilisée par le RIE
ICPBravo Access ICPBrasil and General PKI Extension.
An indicator showing HTTP/2 support in the address bar.