PrefBar Requires Restart
Preferences in Tools Menu Requires Restart
Adds the Preferences item back to the Tools Menu...
Track your Firefox's (about:config) preferences for unwanted changes.
This addon makes use of PrefixFree (http://leaverou.github.com/prefixfree/) to make any page's CSS3 work with your browser. This is especially useful when a site only uses selectors with browser prefixes not targeting your own browser.
Prefsearch Requires Restart
Research the preferences listed in about:config via Google.
PreviousPage Requires Restart
Shows previous page in the sidebar.
Print the current page you see.
Print Hint Requires Restart
This extension helps you to quickly find printer-friendly versions of webpages. ...
Print Preview Button Requires Restart
Adds a print preview toolbar button. After installing the extension, find the print preview button in the toolbar customization...
Print Preview in Firefox only available in Windows
Privacy + Requires Restart
Better Protection. Did you know that web sites use Flash to track you with Flash based cookies?
Privacy Plus will add a simple checkbox in the [Clear Recent History] dialog that will allow you to delete these cookies (Flash LSO) anytime you like.
Toolbar panel for restarting the application with(out) multiple processes and for changing the maximum number of content processes. This extension requires Firefox 47 or newer!
Professor X Requires Restart
The Professor X Extension let's you see inside a page's head without viewing the sourcecode...
ProfileComplete Requires Restart
Automatically completes profile information on other sites. Open a profile on orgbit.com, and then use the extension to complete your data on myspace, etc. Currently building our list of integrated...
Provides an Edit in Prose link from a hosted file on GitHub.
Proxy Finder is an advanced proxy management tool. With Proxy Finder, you can easily change your geo-location in one click!
Proxy Switcher Featured
Access to the complete Firefox's proxy settings right from a toolbar panel