Cost / License
- Free
- Open Source (MIT)
Platforms
- Microsoft Edge
- Google Chrome
- Firefox

Browse 1,771 Mozilla Firefox Plugins, Add-ons and extension on AlternativeTo.

Fierr is an extension for Mozilla Firefox that replaces the default error page with a useful, visually appealing page with three buttons: Back, Reload, and Search. The background image of the error page is a high quality 500x500 logo matching the product.



New Tab Override was developed from the ground up as so-called WebExtension. This makes New Tab Override compatible with Firefox 57 and later. Not all options of the previous version are currently available as WebExtension.




Password Depot is a powerful and very user-friendly password manager which helps to organize all of your passwords. But also, for instance, information from your credit cards or software licenses.




Completely browser-based online meetings and webinars platform with interactive audio/video conferencing, screen sharing, recording, moderator tools, analytics, chat, and calendar integrations.





Modern browsers such as Mozilla Firefox can tell websites where you're located in order to provide location-aware functionality. Your geographic location is obtained through various means (eg. using wifi data) and is often highly accurate, which can be a violation of your...



The first dedicated pop-under blocker!
Block all these annoying popups and popunders that pop no matter where you click on a page. No configurations. Easy options. Transparent in use.


CharacterCodes.net is a comprehensive online resource for finding HTML character codes, ASCII codes, and Unicode characters.




Need to test your web pages out in Internet Explorer, Chrome, Safari, Opera (or anything else for that matter)?





After installing BookmarkDupes, the basic usage is rather simple: To open, click the extension symbol (duplicate stars) or use the link in the options page of the extension. Then select what you want to display: Bookmark duplicates, Empty folders, Non-duplicate bookmarks, All...



Use this extension to generate MLA, AMA, and APA-style citations for the websites you visit. Please send comments and feature requests/bugs to citethis@angelforge.org. Look for the Note icon in your Add-on Bar.

WAVE is a visual web accessibility analysis tool that evaluates web accessibility based on the Web Content Accessibility Guidelines (WCAG).
Use the design system you already have. Extract design tokens from websites and use them in code and in your design tool.



Display what you're currently watching or listening to in your Browser on YouTube, YT Music, Netflix, Soundcloud and much more in your Discord Rich Presence.



Always open new tabs to the right of the current one(which is not the same as setting browser.tabs.insertRelatedAfterCurrent to true). You can however get the default behaviour by:




Declutter your browser by snoozing tabs and windows until you actually need them. Snoozz tabs and windows now and have them reopen automatically later.




This is the new tab you are dreaming of. Support website URL group management, data sync, dark theme mode, todo, weather, speed dial, search.




My TON wallet. Free TON blockchain wallet allows you creating new accounts, make backups, restore them, send transactions and much more. You will be able to transfer CRYSTALS between accounts quickly and securely. Open source code on Github.




This extension will save automatically the content in textarea or WYSIWYG editor when user is typing. User can recover the saved texts in the cache window, even the tab or the window is closed unexpectedly.
