This provides tree-style tab bar, like a folder tree of Windows Explorer. New tabs opened from links are automatically attached to the parent tab. If you often use many many tabs, it will help your web browsing because you can understand relations of ...

Copy to the clipboard the current document's address with additional information.

Allows the user to easily enable or disable the browser's use of Tor, which stands for "the Onion Router", a system providing strong anonymity. Also works with Thunderbird.

Ads page zooming buttons to the toolbar for easy access to the full page zoom feature in Firefox 3.

Useful paste and go, paste and search added to search and location bar context menu.

Run Javascript like an extension without building a new one.

Save files to user-defined folders and their sub-folders straight from context menu without opening the save dialog.

Blocks all scripts on a page unless it is from a site whitelisted by the user.

Enables mailto links to be directed to webmail applications for email composition.

A Firefox browser extension for WYSIWYG MathML editing. Site includes installation instructions, usage examples, FAQ, a discussion forum and links to resources.