HttpFox monitors and analyzes all incoming and outgoing HTTP traffic between the browser and the web servers.
Clear Cache Button
Adds a clear cache toolbar button. After installing the extension, find the clear cache button in the toolbar customization panel.
Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.
The Web Developer extension adds a menu and a toolbar with various web developer tools.
This add-on adds a customizable presence to your browser window's statusbar that gives you
up-to-date information on your browser's cache usage, both RAM and the hard drive.
Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse.
Firecookie is an extension for Firebug that makes possible to view and manage cookies in your browser.
Puts emphasis on the domain to reduce spoofing risk, linkifies URL segments.
Toolbar for uCoz users.
Ctrl+Tab navigation and "All Tabs" panel
Session Manager saves and restores the state of all windows - either when you want it or automatically at startup and after crashes.
It can also automatically save the state of open windows individually.
CoLT makes it easy to copy either a hyperlink's text or both the link and the link's text (in a format you specify). Two handy context-menu items make this possible,
and don't add clutter; the items are only visible when right-clicking a link!
Popup ALT Attributes
Popups alternate texts of images or others like NetscapeCommunicator(Navigator) 4.x, and show long descriptions in the multi-row tooltip like MSIE.
Save image in Folder
Easily save images in personally customized folders.
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.
Cookie Monster provides proactive cookie management on a site or domain level basis, including 3rd party cookies. Via the status bar,
it provides easy access to enhanced cookie functionality, while doing so in a non-intrusive manner.
Extended Status bar
A Statusbar with speed, percentage, time and loaded size (similar to Opera's one)
Customize application menus: Rearrange or remove menuitems from the main context menu (right-click menu) and main menubar (File Edit View etc.)
Free, easy-to-install "skins" for Firefox. Choose from over 180,000 cool designs, including art from Harry Potter and Bob Marley.
Join over 8 million people from around the world who are asking themselves: "What Will My Browser Wear Today?"
Google Docs Viewer
View PDF, DOC, DOCX, PPT, PPTX and TIFF files online with Google Docs, i.e. a right-click on a link and another for "Open". Supports bookmarked URLs.