Html Validator
HTML Validator is a Mozilla extension that adds HTML validation inside Firefox, Mozilla. The number of errors of a HTML page is seen on the form of an icon For Firefox 56, use 0.974 (see all versions below). For Firefox 57, see Web Extensions.
9,314 users
You.com | The Search Engine You Control
Sets Firefox's default search engine to You.com
9,310 users
Mobile emulator
Smartphone emulator on computer very realistic with several models to test mobile websites.
9,296 users
Progressive Web Apps for Firefox
A tool to install, manage and use Progressive Web Apps (PWAs) in Mozilla Firefox
9,272 users
Profile Switcher for Firefox
Create, manage and switch between browser profiles seamlessly.
9,254 users
Google Page Translate
Adds a toolbar button to open Google Page Translate for the current tab.
9,208 users
9,198 users
Activate Reader View
This add-on adds a button to the toolbar. Clicking on it activates the Reader View even if the icon in the address bar is not present.
9,147 users
Alitools shopping assistant
Auto-find & apply AliExpress ™ promo codes, price history, seller rating, similar products, find item by picture
9,103 users
Instant Gaming
Browse the web for your favorite games and always know if they are available at Instant-Gaming.com !
9,038 users
Private Bookmarks
Enables a password-protected bookmark folder.
9,038 users
Пульс
Новые визуальные закладки Mail.Ru
8,981 users
Hide My IP Free
Hide Your IP Address and Unblock Websites for Free with the Hide My IP proxy and VPN IP network. Thousands of IPs around the world to choose from. Access your favorite streaming sites by changing your IP location. No ads or limitations.
8,969 users
Shortkeys (Custom Keyboard Shortcuts) for Firefox
Easily customizable custom keyboard shortcuts for Firefox. To configure this addon go to Addons (ctrl+shift+a) ->Shortkeys ->Options. Report issues here (please specify that the issue is found in Firefox): https://github.com/mikecrittenden/shortkeys
8,954 users
Highlighter + Notes
Add Highlights and Notes to a Web Page
8,929 users
FantasyPros: Win your Fantasy League
Get expert advice for your fantasy team from any website
8,910 users
8,892 users
Angular DevTools
Angular DevTools extends Firefox DevTools adding Angular specific debugging and profiling capabilities.
8,878 users
Bookmarks clean up
Find and remove duplicated bookmarks manually and in batches, get rid of broken bookmark links and empty folders.
8,873 users
Tab Counter
Add a badge to the toolbar that shows the number of currently open tabs in a window or all windows.
8,864 users
Session Sync
Save sessions as bookmarks and access them across devices. Advanced Session Manager: edit, save, change, restore. It can also be your best Bookmark Manager
8,842 users
Avast SecureLine VPN
Control your Avast SecureLine VPN from the comfort of your browser. Easily turn your VPN on and off, or change your server location, with our simple but powerful extension. All you need is Avast SecureLine VPN with a valid license.
8,841 users
Refined GitHub
Simplifies the GitHub interface and adds many useful features.
8,814 users
BuiltWith
BuiltWith is a web site profiler tool. Upon looking up a page, BuiltWith returns a list all the technologies in use on that page that it can find.
8,813 users
Adaware AdBlock
By blocking annoying ads and nosy trackers, Adaware AdBlock nearly doubles your browsing speed! And with the most robust antivirus-level cloud-scanning technology of any ad blocker on the market, you’ll be safe from the latest cyber-threats.
8,771 users