User Interface

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DOM Inspector

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.

Rated 5 out of 5 stars (61)
150,625 users

AutoPager

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.

Rated 4 out of 5 stars (400)
79,448 users

URL Fixer Plus RU and UA

Extended URL Fixer for RU and UA

Rated 4 out of 5 stars (20)
57,473 users

Full Screen mobile No Restart

Make Firefox for Android use the whole screen

Rated 3 out of 5 stars (81)
21,558 users

AutoAuth

AutoAuth automatically submits HTTP authentication dialogs when you’ve chosen to have the browser save your login information.

Rated 4 out of 5 stars (47)
14,159 users

JSONovich No Restart

Pretty-prints JSON content in the browser for easy, unobtrusive viewing.

Rated 4 out of 5 stars (30)
10,047 users

AutoPager Fixed

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!

Rated 5 out of 5 stars (24)
9,377 users

Cloud Viewer No Restart

Open various types of files in Google Docs Viewer

Rated 4 out of 5 stars (42)
7,347 users

URLFilter No Restart

Block advertisement and access to adult sites

Rated 4 out of 5 stars (13)
5,908 users

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.

Rated 4 out of 5 stars (43)
5,431 users

lolifox - Fierr MOD

Replaces the error page with a lolifox appearance with additional features.

Rated 5 out of 5 stars (15)
4,393 users

Fierr

Replaces the error page with a more stylish appearance with additional features.

Rated 5 out of 5 stars (51)
3,345 users

AVIM

An input method editor (IME) for Vietnamese. Type Vietnamese diacritics directly into any Web page, Web app, or dialog box.
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Bộ gõ tiếng Việt cho phép đặt dấu trực tiếp vào bất kỳ trang Web, ứng dụng Web, và hộp thoại.

Rated 5 out of 5 stars (30)
2,998 users

South African English spell checker

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!"

Rated 5 out of 5 stars (3)
2,778 users

Stylish-Custom

custom additions to Stylish extension.
brings back features from 0.5.9 and adds new features

I can't be bothered to change SC, so amo will allow it to be uploaded
http://choggi.org/misc/Stylish-Custom/

Rated 4 out of 5 stars (37)
2,769 users

Safe for Amoled No Restart

Darkens the background of the page

Rated 4 out of 5 stars (18)
2,526 users

TabsInForeground No Restart

Always open Tabs in foreground. Use system back button to close again.

Rated 5 out of 5 stars (13)
2,372 users

LinkyMobile No Restart

LinkyMobile is a Firefox/Firefox Mobile Addon to converts text links into genuine, clickable links.

Rated 4 out of 5 stars (5)
996 users

Big Navigation No Restart

Increases the navigation links on the pages

Rated 5 out of 5 stars (4)
932 users

NextPage for mobile No Restart

A button in the navigation toolbar,auto find and navigate to the next page for you.It works for all sites.

Rated 5 out of 5 stars (3)
642 users