NoRedirect lets the user take control of HTTP redirects. It can be used to interdict an ISP's DNS search redirection hijacks, preview/screen "shortened" URLs (e.g., TinyURL), stop the annoying redirection of "smart" error pages, etc.
Magnifier No Restart
A quick restartless magnifier to debug styles and web pages.
aXe Developer Tools No Restart
Add accessibility auditing to the Firefox Developer Tools
Selenium IDE is an integrated development environment for Selenium tests. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests.
Cookie Watcher is a tool to watch selected cookie in a statusbar.
This extenion is GUI Front-end of "about:cache"...
SuperStop No Restart
SuperStop adds a Shift+Esc shortcut that stops background requests and animations even when the Firefox Stop button is disabled.
Speed Tweaks (SpeedyFox) No Restart
This extension provides a list to almost all the settings that you may need to alter in order to enhance Firefox's speed.
Restore Linkinfo and FormInfo which has been deleted from PageInfo of Firefox3.
This extension does not seem to work on MAC.
Toggle Mixed Active Content No Restart
An icon that toggles the preference of blocking mixed active content.
Preference Name: security.mixed_content.block_active_content
JSON-formatter No Restart
Click addon's icon to quick format JSON document with tabs and new lines.
Permanently hide content from web pages using the Context Menu. Simply, click and "Remove it Permanently". Now includes previewing of items before removal, support for IFrame as well as lots of advanced features to make it easy for...
Shows web page sources in tab.
FlareGet Integration No Restart
FlareGet Browser Integration extension
FillForm is a small extension to help you fill page forms.
Fill out current web all forms with a keyboard shortcut(Alt + Q).
Preferences Monitor No Restart
Track your Firefox's (about:config) preferences for unwanted changes.
Hide My IP VPN No Restart
Hide My IP VPN is number one tool for hiding your IP and unblocking any web site!