Add-ons
To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
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Choose from thousands of extra features and styles to make Firefox your own.
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4,690 matching results
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Markdown Viewer
Requires Restart
Markdown document viewer.
Allows to visualize formatted markdown documents in browser.
Oxford Dictionaries
Search Oxford Dictionaries Online for English word definitions.
Tab Counter
A simple extension that counts the number of open tabs per window and displays the count in the toolbar...
Open Multiple Locations
Requires Restart
Adds a "File" menu option to open multiple locations at a time.
dictCheck
Requires Restart
dictCheck - Double click on any english word in a page to get the polish meaning. Uses fast online dictionary.
Simple and easy! Enjoy!
Copy As Plain Text
FavLoc
Requires Restart
FavLoc allows you to set folders as "favorite locations" to which you can easily download. FavLoc menus will appear on the File menu (for saving pages), the context menu (for saving images and links), and on the download...
RequestPolicy v0.5 Legacy
Requires Restart
Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.
Torrent Meta Search
Thunderbird Biff
Requires Restart
This add-on provides a visual indicator of new Thunderbird mail availability in supported clients (Firefox, Sunbird) and Thunderbird itself. Note: you MUST install this add-on in BOTH Thunderbird and supported clients as there are both client AND ser...
Greek - English (US) Spelling dictionary
Combined Greek - English (US) spell checking dictionary for Firefox - Thunderbird - Seamonkey
Yahoo! UK & Ireland
YouTube OpenSearch
searx.me
ConQuery
Requires Restart
Context searching for everyone and URL manipulation tool for advanced users...
WEB.DE Search
With WEB.DE Search you safely and quickly find what you are searching for.
wmlbrowser
Requires Restart
Simulate WAP browsing by viewing WML (Wireless Markup Language) pages.
TryAgain
Requires Restart
TryAgain keeps trying to load a webpage when the server cannot be reached.
Cambridge dictionaryTo create your own collections, you must have a Mozilla Add-ons account.
