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Flagfox No Restart

Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...

Rated 5 out of 5 stars (625)
679,502 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)
77,456 users

Google search link fix No Restart

This extension prevents Google, Yahoo and Yandex search pages from modifying search result links when you click them. This is useful when copying links but it also helps privacy by preventing the search engines from recording your clicks.

Rated 5 out of 5 stars (110)
67,277 users

SmoothWheel

Scrolls the page smoothly when scrolling the mouse wheel (or keyboard arrows if enabled).

Rated 5 out of 5 stars (243)
48,629 users

QuickDrag

Extends the function of the drag-and-drop mouse gesture so that it can be used to load URLs, do a web search of selected text on a page, or save an image on a page. The successor to Super DragAndGo.

Rated 4 out of 5 stars (316)
41,623 users

Who stole my pictures?

Search for copies of the images using Yandex.ru, Tineye.com, Google.com and VK.com via right click menu

Rated 5 out of 5 stars (47)
18,277 users

googlebar

The original (though unofficial) Google toolbar for Firefox, with an emphasis on easy access to many types of specialized searches.

Rated 4 out of 5 stars (90)
8,816 users

WikiLook

Leading dictionary lookup add-on. Fast, light, open source tool that define words for you without need to open new tabs or windows. Wiktionary&Wikipedia.

Ctrl or Shift or Alt + RightMouseButton click. Now with thesaurus.

70+ languages supported!

Rated 4 out of 5 stars (154)
7,748 users

lolifox - Fierr MOD

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

Rated 5 out of 5 stars (14)
4,348 users

Whois & Flags Firefox & Websites Popularity Rating

Display Country Flag indicating Website Physical Location (Country, State, City). Website Popularity (Live Visitor Statistics). Shows how many users are visiting any World Website per day. Website IP IPv6 Addresses, DNS, Hosting. IP Whois Lookup

Rated 4 out of 5 stars (15)
3,281 users

SD Tools

Sharedir.com tools for working with rapidshare, netload, rapidgator links and links from other popular file sharing sites via right-click or Tools menu.
Extract links / test selected links / convert links to 'direct download' links, and much more.

Rated 4 out of 5 stars (5)
1,459 users

mid

More than 2000 dictionaries in 270 Kilobyte! Search multiple dictionaries at once!

Rated 5 out of 5 stars (7)
1,373 users

Paste to Tab and Go

Paste URL or text to any tabs or a new tab and load it immediately, like 'Paste & Go' feature, but unlike 'Paste & Go', this extension will paste text from clipboard to a tab without focusing on the tab first.

Rated 4 out of 5 stars (28)
1,307 users

Multi Web Search

For those who are looking for and want to find!
Find the most relevant information from the Web with a single request to different search engines and get the results on a single page

Rated 4 out of 5 stars (3)
791 users

WikiSearch

Search Wikipedia through the context menu.

Rated 4 out of 5 stars (7)
777 users

SmartWhois Launcher

This extension allows you to launch SmartWhois and perform a Whois query on the current URL. SmartWhois is a useful network information utility that allows you to look up all the available information about an IP address, hostname or domain...

Rated 3 out of 5 stars (6)
533 users

ConQuery

Context searching for everyone and URL manipulation tool for advanced users...

Rated 5 out of 5 stars (38)
479 users

RSE Tools

Tools for working with rapidshare and links from other popular file hosting and sharing services.
Features: get rapidshare links from a page, test selected rapidshare links, search rapidshare files for selected terms, etc.

Rated 4 out of 5 stars (20)
439 users

Zorcher

Selecting a small text on the page do not need to copy it into the search bar of your browser or search engine. Just press the right mouse button and select the search service from the available list.

Rated 5 out of 5 stars (10)
321 users

CannaFox Marijuana Add-On

SeedFinders CannaFox Marijuana Add-On connects the threads from 38+ homegrow forums worldwide with more than 4500 medical marijuana strains. You also can search and browse through seedfinders cannabis-strain-database directly from your sidebar.

Rated 4 out of 5 stars (2)
260 users