Top-Rated Extensions

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QuickNote Requires Restart

A simple note-taking extension.

Rated 5 out of 5 stars (190)
21,209 users

Identity Chooser Requires Restart

Identity Chooser helps you to always use the correct identity when composing a new email.

Rated 5 out of 5 stars (90)
7,739 users

Nostalgy Requires Restart

Keyboard shortcuts to change folder, move/copy messages, with folder name auto-completion.

Rated 5 out of 5 stars (144)
7,723 users

Browser Backgrounds Requires Restart

Browser Backgrounds is the new Firefox extension that lets you install backgrounds directly on your browser.

Rated 5 out of 5 stars (38)
5,013 users

Password Tags Requires Restart

Adds metadata and sortable tags to the password manager.

Rated 5 out of 5 stars (13)
1,244 users

Transliterator

As-you-type phonetic conversion of text from one alphabet to another, as well as transliteration/detransliteration of selected text anywhere within documents. Supports multiple languages and custom transliteration schemes.

Rated 5 out of 5 stars (83)
4,524 users

PlayFlash 64bit Requires Restart

Flash player plugin - unofficial xpi repack for 64bit browsers. Use when official plugin installer is not suitable. All binary files are copyrighted by their authors and distributed for free.

Rated 5 out of 5 stars (26)
5,822 users

Rai Smooth Streaming Player (raismth) Requires Restart

Rai.tv live channels, vod and replay contents w/o *light (Silverlight/Moonlight)

Rated 5 out of 5 stars (33)
1,546 users

IMAP Received Date Requires Restart

Make the “Received” column in IMAP folders show when messages were actually received.

Rated 5 out of 5 stars (10)
1,999 users

about:addons-memory 2016

Adds a new page that shows add-on memory usage

Rated 5 out of 5 stars (37)
8,796 users

Remote XUL Manager

Manages the Remote XUL whitelist to allow websites and local files to load XUL content. For versions compatible with Firefox 41 and lower, see All Versions page below.

Rated 5 out of 5 stars (35)
81,042 users

Simple Locale Switcher Requires Restart

An easier management of the user interface language

Rated 5 out of 5 stars (12)
28,018 users

N0HR Propfire Requires Restart

HF radio propagation status displayed in your browser status bar. Shortwave radio enthusiasts, ham radio operators and others can use this to monitor solar conditions that impact radio propagation. Usage, updates and support can be found at...

Rated 5 out of 5 stars (20)
667 users

Extension Auto-Installer

Extension Auto-Installer is a helper for Firefox/SeaMonkey/Thunderbird extension developers: it allows automatically adding or updating browser extensions, e.g. via command line tools. This makes testing your changes easier.

Rated 5 out of 5 stars (49)
1,795 users

WorldIP - Geo Add-on with Security Features Requires Restart

Professional Geo Add-on with security features and advanced network tools. Anti-phishing. Protection against DNS spoofing and fake sites. All DNS records for domain. The real location of web server, country flag, extended information about datacenter

Rated 5 out of 5 stars (122)
18,125 users

lolifox - Fierr MOD Requires Restart

Replaces the error page with a lolifox appearance with additional features.

Rated 5 out of 5 stars (34)
2,142 users

Select like a Boss

Select link's text just like a regular text (like in Opera'12 browser) - Select like a Boss ;)

Rated 5 out of 5 stars (41)
2,262 users

Mail Merge Requires Restart

Mass Mail and Personal Mail

Rated 5 out of 5 stars (150)
54,373 users

DSLR Notifier 2

Updated version of the original DSLR Notifier, created by Ryan Flint, which enables members of Dsl/Broadbandreports.com to keep tabs on their instant messages and updated...

Rated 5 out of 5 stars (9)
56 users

Extended Link Properties + (obsolete) Requires Restart

This application extends the Link Properties and displays File Size, Last Modified Date, Content Type and HTTP Header of a link...
Warning: developing discontinued, see least

Rated 5 out of 5 stars (11)
420 users