DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.
Extended URL Fixer for RU and UA
AutoPager automatically loads next pages when you reach the end of a page. It works on a ton of sites,Google,Yahoo..
It works well with most other add-ons adblock plus, WOT and most of the greasemonkey scripts.
You can also try AutoPagerLite.
AutoPager Fixed is a working version of AutoPager extension for Firefox 36+ (non-E10s mode) to autoload the next page(s) when you scroll pages.
ATTENTION: DISABLE THE ORIGINAL AUTOPAGER ADDON!
Full Screen mobile No Restart
Make Firefox for Android use the whole screen
AntiGameOrigin v6 No Restart
AntiGameOrigin - the other OGame experience for all communities.
AutoAuth automatically submits HTTP authentication dialogs when you’ve chosen to have the browser save your login information.
JSONovich No Restart
Pretty-prints JSON content in the browser for easy, unobtrusive viewing.
No need flash plugin on embeded youtube movies
Worldwide Sunrise, Sunset, Twilight, Moonrise and Moonset...
URLFilter No Restart
Block advertisement and access to adult sites
Replaces the error page with a lolifox appearance with additional features.
Cloud Viewer No Restart
Open various types of files in Google Docs Viewer
Vietnamese-language input method editor (IME). Type diacritics directly into any Web page, Web app, or dialog box. Convenient, comprehensive, secure.
Bộ gõ tiếng Việt cho phép đặt dấu trực tiếp vào bất kỳ trang Web, ứng dụng Web, hộp thoại.
Twitter Address Bar Search No Restart Featured
Mozilla Firefox with Twitter instantly connects you with what's happening in the world. Search people and topics on Twitter using @ and # from the address bar.
Replaces the error page with a more stylish appearance with additional features.
Safe for Amoled No Restart
Darkens the background of the page
TabsInForeground No Restart
Always open Tabs in foreground. Use system back button to close again.
The South African English spell checker allows you to use place names, borrowed words, and other expressions that are unique to South Africa.
"No more eina, just a lekker spell checker!"
A modified Dorando's tool to rebind keys in Mozilla apps. It is designed to be a drop-in replacement, and will keep your old settings. (See details for upgrade instructions.)