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 (55)
153,403 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 5 out of 5 stars (360)
118,777 users

Full Screen mobile No Restart

Make Firefox for Android use the whole screen

Rated 3 out of 5 stars (82)
50,918 users

URL Fixer Plus RU and UA

Extended URL Fixer for RU and UA

Rated 4 out of 5 stars (20)
50,483 users

Cloud Viewer No Restart

Open various types of files in Google Docs Viewer

Rated 4 out of 5 stars (34)
16,122 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 (38)
15,217 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 (43)
13,008 users

JSONovich No Restart

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

Rated 4 out of 5 stars (28)
8,944 users

lolifox - Fierr MOD

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

A new version 1.0.9.0 (not fully reviewed by Mozilla yet) is available here ( https://addons.mozilla.org/addon/7871/versions )

Rated 5 out of 5 stars (11)
4,974 users

URLFilter No Restart

Block advertisement and access to adult sites

Rated 4 out of 5 stars (9)
4,331 users

AVIM

An input method editor (IME) for Vietnamese. Type fully-accented Vietnamese directly into any Web page or dialog box using a standard keyboard.
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Bộ gõ tiếng Việt để nhập dấu trực tiếp vào bất kỳ trang Web và hộp thoại dùng bàn phím bình thường.

Rated 5 out of 5 stars (26)
4,045 users

Fierr

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

Rated 5 out of 5 stars (44)
4,011 users

Stylish-Custom

abandoned, use Stylish Custom Add-on instead
http://forum.userstyles.org/discussion/37939/stylish-custom-add-on/p1

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

Rated 4 out of 5 stars (36)
3,558 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)
3,333 users

Safe for Amoled No Restart

Darkens the background of the page

Rated 4 out of 5 stars (12)
2,980 users

TabsInForeground No Restart

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

Rated 5 out of 5 stars (8)
2,102 users

LinkyMobile No Restart

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

Rated 5 out of 5 stars (3)
1,063 users

Bigger Text Featured

Make fonts larger and more readable

Rated 4 out of 5 stars (7)
1,045 users

Big Navigation No Restart

Increases the navigation links on the pages

Rated 5 out of 5 stars (4)
737 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)
696 users