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Get started with Firefox extension development
Development

Extensions provide a simple and powerful way to personalize your browsing experience. If you know JavaScript, CSS, and HTML, you can build your own. If you are brand-new to add-on development, you can get started by che…

6 12613 September 6, 2023
Code in content_scripts not executed when document changes?
Development
1 17 December 1, 2024
What version of Android Firefox added support for MV3?
Development
4 183 November 30, 2024
Firefox Profiler Deployment (November 27, 2024)
Firefox Tooling Announcements
firefox-profiler
1 58 November 29, 2024
Error testing addon with web-ext in Android. Unable to retrieve current user
Development
5 90 November 29, 2024
Will Mozilla ever put Firefox Bookmarks Manager in a tab?
Firefox Development
4 420 November 28, 2024
Extension for block ads does not work as it should
Development
4 88 November 28, 2024
Cutoff date for Dec dataset release is Dec 6th
Common Voice
1 48 November 28, 2024
Browser takes huge part from my screen, take it back to normal!
Developer Tools
3 72 November 28, 2024
Why is it so hard to implement multiple profiles just like chrome
Community Portal
3 957 November 27, 2024
Speech Recognion resul
Common Voice
learning ,  issue
2 70 November 27, 2024
Happy BMO Push Day! (20241126.1)
Firefox Tooling Announcements
1 58 November 26, 2024
Concerns about low quality Japanese voice data / 日本語の低品質データについて
Common Voice
participation ,  sentence-collection
2 88 November 26, 2024
Thought-provoking stories - Not Auto-refreshing
SSO Dashboard
1 52 November 26, 2024
Assessment wanted for Object basics task 2 skill test
Learn
4 539 November 25, 2024
Unable to Reply to a user Review of my add-on
Add-on Support
5 118 November 25, 2024
declarativeNetRequest - dynamic rule not resulting in a redirect
Development
3 148 November 25, 2024
An Important Update on Mozilla WebThings
WebThings
15 152144 November 25, 2024
How to programmatically access Firefox power consumption metrics?
Developer Community
1 47 November 25, 2024
What does the "Here's a quick reminder that you can keep your favourite indie browser just one click away" prompt text mean?
Firefox Development
feedback
2 254 November 25, 2024
Pабота с дополнением (расширением) по YouTube-скачиванию
Firefox for Android Add-ons
1 111 November 24, 2024
About:config save cookiebanners.service.mode
Firefox On Android
1 91 November 24, 2024
[Feature Request] Password protected containers
Firefox Containers
12 6062 November 23, 2024
SEO Extensions
Add-on Support
seo
2 1391 November 10, 2020
Clicking on notification from MV3 extension has no effect if background script suspended
Development
8 266 November 23, 2024
Why is the backspace menu missing in Firefox Nightly
Firefox On Android
1 64 November 22, 2024
Firefox doesn't give me a stack trace on response details when using the Network Monitor tool
Developer Tools
3 133 November 21, 2024
Options.html (as popup) & file picker
Development
4 136 November 22, 2024
About:config missing
Firefox On Android
47 52818 November 22, 2024
Firefox Relay does not forward received emails
addons.mozilla.org
20 5316 November 21, 2024