CSS Refresh - Firefox Addon - Adds "Refresh CSS" context menu item, accessible by right-clicking anywhere on the page. It will reload all the stylesheets on the page without refreshing the page itself. It also can be activated by using CTRL-SHIFT-R.
Especially useful for AJAX development
Bugzilla Tweaks - This Firefox extension modifies the pages loaded from bugzilla.mozilla.org and adds features including:
• Interleaving the bug's change history with the comments on the same page
• Showing the last time that a bug or attachment flag was changed
• Proving user name autocompletion support
• And many more..
Mobile Tools - Tools for working with web pages in Firefox Mobile. Use tools like Page Info to view details about the current web page or use Page Source to view the actual web page source. A Firebug Console API is also supported for helping to debug web pages on mobile devices
Search C functions in c.conclase.net. This search engine only searches functions within the programming language C, so that returns a Spanish page with the syntax, examples, library to which it belongs, so that function. If there is the desired function will return an error page
Who Is Hosting This.com is a popular webmaster tool that lets you discover who is hosting any web site, as well as publishing hosting reviews, our blog & more. The search plugin lets you query the site from your Firefox browser.
The tool provides a profile of the hosting company in question (where applicable), IP address and DNS information