Greasemonkey
Customize the way a web page displays or behaves, by using small bits of JavaScript.
196,616 users
German Dictionary (Switzerland)
Dictionary with Swiss variants of German words for spellchecking in Firefox.
192,863 users
German Dictionary, extended for Austria
German dictionary ("new" orthography) for spellchecking in Firefox, extended with Austrian words
192,491 users
Language: Български (Bulgarian)
Firefox Language Pack for Български (bg) – Bulgarian
192,436 users
Video Downloader professional
- download and save videos embedded into a website to your hard disk - add youtube, vimeo and other videos easily to your video list - supports up to 4k videos
188,413 users
Language: Türkçe (Turkish)
Firefox Language Pack for Türkçe (tr) – Turkish
187,263 users
React Developer Tools
React Developer Tools is a tool that allows you to inspect a React tree, including the component hierarchy, props, state, and more. To get started, just open the Firefox devtools and switch to the "⚛️ Components" or "⚛️ Profiler" tab.
186,863 users
Language: Slovenčina (Slovak)
Firefox Language Pack for Slovenčina (sk) – Slovak
186,377 users
Avast Online Security & Privacy
Secure your Mozilla Firefox browser against real-time online threats, trackers, and scams. We’ll check every site you visit, from Facebook to your bank, so nothing puts you or your data at risk. Join a growing community of 400 million Avast users.
184,343 users
Language: Indonesia (Indonesian)
Firefox Language Pack for Indonesia (id) – Indonesian
183,070 users
Video Background Play Fix
Some sites may not work with Firefox for Android video background play feature. This add-on provides a quick fix by blocking the Page Visibility API and the Fullscreen API.
180,840 users
Pinterest Save Button
Save your favorite ideas online so you can easily get back to them later.
177,366 users
Language: ไทย (Thai)
Firefox Language Pack for ไทย (th) – Thai
173,671 users
Language: Cрпски (Serbian)
Firefox Language Pack for Cрпски (sr) – Serbian
171,643 users
Language: עברית (Hebrew)
Firefox Language Pack for עברית (he) – Hebrew
171,244 users
Language: Lietuvių (Lithuanian)
Firefox Language Pack for Lietuvių (lt) – Lithuanian
170,603 users
Language: Slovenščina (Slovenian)
Firefox Language Pack for Slovenščina (sl) – Slovenian
170,023 users
169,775 users
Language: Eesti (Estonian)
Firefox Language Pack for Eesti (et) – Estonian
166,261 users
Hoxx VPN Proxy
Hoxx VPN Proxy service to unblock blocked websites, hide your location and encrypt your connection. Completely free.
165,843 users
Language: فارسی (Persian)
Firefox Language Pack for فارسی (fa) – Persian
164,988 users
FireShot: Full Web Page Screenshots (♥♥♥♥♥)
FireShot makes full page screen captures - http://bit.ly/RlBQMV Screenshots are quickly captured and: ― Saved as Image / PDF with links and text ― Sent to clipboard ― Printed Capture all open tabs or provide a list of the URLs for grabbing
163,501 users
163,006 users
YouTube High Definition
YouTube High Definition is a powerful tool that automatically plays all YouTube videos in HD, changes video player size, offers auto-stop and mute, and much more.
162,878 users
Maps Assist & Custom Web Search
Install the Maps Assist & Custom Web Search extension to get directions by clicking the favicon on the toolbar & enjoy Yahoo® search from your browser.
162,795 users