Add-ons
To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
CloseWelcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.
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Update Notifier
Requires Restart
Note from Mozilla: This add-on has been discontinued. Try Add-on Update Checker instead.
Notifies you when updates are available for your extensions and themes.
URL Fixer
URL Fixer fixes common typos in URLs entered in the address bar. It will fix errors like "google.con" or "youtube,com". You have the option of being asked to confirm corrections before they are applied.
URL Flipper
Requires Restart
Quickly and easily increment and decrement numbers and strings in URLs for navigating through URL sequences.
url.ba shortener
UrlCorrector
Type web addresses always in Latin letters no matter of your current keyboard layout.
URLFilter
UrlParams
Requires Restart
Shows you the GET and POST parameters of the current website in the sidebar...
User Agent Changer
Requires Restart
Adds a menu and a toolbar button to change the user agent of a browser.
User Agent Switcher
Requires Restart
The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.
Validaty
Requires Restart
One Click Validator. Provides you a button to validate a page using a validator like w3c or another user defined
Version in Add-on bar
Requires Restart
Show the Firefox/Thunderbird version number in the addon bar (formerly called status bar).
Version Number in Add-ons Manager
[Restartless] [e10s Compatible]
Easily viewable version info in the Add-ons Manager on Firefox/Thunderbird 41.0 - 56.*
Also restores the add-on version number on Firefox/Thunderbird 41.0 - 56.*.
Video Mouse Wheel
Use wheel mouse on videos to control video/audio/quality.
Choose flash/HTML5 on YouTube, autopause on background tabs, embedded videos.
And much more!
Video Pinner
Pins a YouTube video to the page so that it is always visible while you scroll and read comments. Port of Chrome's Video Pinner extension
View Dependencies
Requires Restart
View Dependencies adds a tab to the Page Info window, in which it lists all the files which were loaded to show the current page.
View Source
View Your Certificates Email Address
Adds a column for displaying the certificates Email address to the "Your Certificates" tab of the Certificate Manager
ViewAbout
Viral Threat Level
Requires Restart
Adds an image to the status bar indicating the current threat level of the internet. It allows quick access to security information that you can use to help protect yourself, and links to antivirus software comparisons and security extensions.
To create your own collections, you must have a Mozilla Add-ons account.
