Extensions by Weekly Downloads

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NoScript Security Suite

The best security you can get in a web browser!
Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.

Rated 5 out of 5 stars (1,321)
95,805 weekly downloads

LastPass Password Manager

LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.

Rated 4 out of 5 stars (1,037)
33,576 weekly downloads

Bluhell Firewall No Restart

Get a faster browsing experience by blocking nasty web resources using Bluhell Firewall, the lightweight Ad-Blocker and Tracking/Privacy Protector.

Rated 5 out of 5 stars (128)
20,537 weekly downloads

Low Quality Flash

Sets Flash objects to "Low Quality" to improve performance on slower platforms (i.e. older computers, netbooks, and Firefox Mobile).

Rated 4 out of 5 stars (39)
7,804 weekly downloads

Full Screen mobile No Restart

Make Firefox for Android use the whole screen

Rated 3 out of 5 stars (82)
6,755 weekly downloads

Phony No Restart Featured

View mobile or desktop versions of sites, by impersonating other browsers' useragent headers.

Rated 4 out of 5 stars (70)
5,098 weekly downloads

FB Phishing Protector No Restart

Protects you from Phishing or Scams (through XSS injection attacks) while you're on Facebook™ - Version 4.2 introduces a Tracking Protection feature as well.

Rated 5 out of 5 stars (18)
5,004 weekly downloads

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)
4,843 weekly downloads

Proxy Mobile

Simple add-on for settings HTTP, SOCKS and SSL proxy settings. Works by default with Orbot: Tor on Android. Developed by the Guardian Project at https://guardianproject.info

Rated 3 out of 5 stars (23)
4,190 weekly downloads

URL Fixer No Restart Featured

URL Fixer fixes common typos in URLs entered in the address bar. It will fix errors like "google.con" or "youtube,com". You have the option of being asked to confirm corrections before they are applied.

Rated 4 out of 5 stars (83)
3,509 weekly downloads

Clean Links No Restart

Converts obfuscated or nested links to genuine clean links.

Eg: http://somesite.com/?to=www.example.comhttp://www.example.com/

Rated 5 out of 5 stars (48)
3,473 weekly downloads

Remote XUL Manager No Restart

Manages the Remote XUL whitelist to allow websites and local files to load XUL content.

Rated 5 out of 5 stars (29)
2,223 weekly downloads

Restartless Restart No Restart

This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.

Rated 5 out of 5 stars (136)
2,014 weekly downloads

Vine Video Download No Restart

Download videos from Twitter's Vine.co short video app.

Not yet rated
1,802 weekly downloads

Cloud Viewer No Restart

Open various types of files in Google Docs Viewer

Rated 4 out of 5 stars (34)
1,792 weekly downloads

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)
1,713 weekly downloads

Disable Add-on Compatibility Checks No Restart

Reinstates the extensions.checkCompatibility preference without respect to the current application version.

Rated 4 out of 5 stars (82)
1,657 weekly downloads

Silent Block

Minimum and fast URL blocking by regular expressions.

Rated 5 out of 5 stars (15)
1,356 weekly downloads

Copy As Plain Text

Removes formatting from copied text.

Rated 4 out of 5 stars (35)
1,344 weekly downloads

wmlbrowser

Simulate WAP browsing by viewing WML (Wireless Markup Language) pages.

Rated 4 out of 5 stars (26)
1,331 weekly downloads