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POW -- Plain Old Webserver

Turn the web on its head with the Plain Old Webserver (POW), which adds a server to your browser.

Rated 5 out of 5 stars (17)
72 users

Power Debugger (Selenium IDE)

A plugin for Selenium-IDE to improve debugging and troubleshooting issues with scripts

Rated 5 out of 5 stars (2)
6,887 users

pqp.vc

Encurte seu stress. E suas URLs.

Not yet rated
3 users

PrefBar

The all in one toolbar(item). Houses and manages bigger amounts of buttons (Clear Cache, Clear Cookies, ...), Menus (User Agent spoof...) and checkboxes (Javascript, Flash, ...). Extensible from online-database or with self created buttons.

Rated 5 out of 5 stars (39)
15,104 users

Preferences in Tools Menu

Adds the Preferences item back to the Tools Menu...

Rated 4 out of 5 stars (3)
3 users

Preferences Monitor No Restart

Track your Firefox's (about:config) preferences for unwanted changes.

Rated 4 out of 5 stars (39)
1,852 users

Prefix-Free Addon No Restart

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.

Not yet rated
6 users

Prefsearch

Research the preferences listed in about:config via Google.

Rated 4 out of 5 stars (10)
200 users

PreviousPage

Shows previous page on the left side

Rated 4 out of 5 stars (2)
15 users

Print Hint

This extension helps you to quickly find printer-friendly versions of webpages. ...

Rated 4 out of 5 stars (16)
677 users

Print Preview Button

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

Rated 5 out of 5 stars (7)
3,685 users

Privacy +

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.

Rated 4 out of 5 stars (22)
418 users

Process Toggle No Restart

Toolbar panel from which you may restart the application with or without multiple processes, and from which you may change the maximum number of content processes. Works in Firefox 46 and newer!

Rated 5 out of 5 stars (2)
85 users

Professor X

The Professor X Extension let's you see inside a page's head without viewing the sourcecode...

Rated 4 out of 5 stars (2)
225 users

ProfileComplete

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...

Rated 5 out of 5 stars (1)
1 user

prose No Restart

Provides an Edit in Prose link from a hosted file on GitHub.

Not yet rated
17 users

Proto.io print helper extension

Enables print functionality in Proto.io

Not yet rated
887 users

ProVision.bg home page button No Restart

ProVision.bg Button addon

Not yet rated
1 user

Proxy Finder (IP Switcher) No Restart

Proxy Finder is an advanced proxy management tool. With Proxy Finder, you can easily change your geo-location in one click!

Rated 3 out of 5 stars (4)
4,672 users

Proxy Switcher No Restart Featured

Access to the complete Firefox's proxy settings right from a toolbar panel

Rated 5 out of 5 stars (11)
47,956 users