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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 12560 September 6, 2023
Why is it so hard to implement multiple profiles just like chrome
Community Portal
3 935 November 27, 2024
Browser takes huge part from my screen, take it back to normal!
Developer Tools
2 18 November 27, 2024
Speech Recognion resul
Common Voice
learning ,  issue
2 28 November 27, 2024
Happy BMO Push Day! (20241126.1)
Firefox Tooling Announcements
1 30 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 58 November 26, 2024
Thought-provoking stories - Not Auto-refreshing
SSO Dashboard
1 27 November 26, 2024
KnitSilk | Crafting Luxury
technology
1 27 November 26, 2024
Assessment wanted for Object basics task 2 skill test
Learn
4 498 November 25, 2024
Unable to Reply to a user Review of my add-on
Add-on Support
5 72 November 25, 2024
declarativeNetRequest - dynamic rule not resulting in a redirect
Development
3 110 November 25, 2024
An Important Update on Mozilla WebThings
WebThings
15 152122 November 25, 2024
How to programmatically access Firefox power consumption metrics?
Developer Community
1 30 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
2 137 November 25, 2024
Pабота с дополнением (расширением) по YouTube-скачиванию
Firefox for Android Add-ons
1 81 November 24, 2024
About:config save cookiebanners.service.mode
Firefox On Android
1 71 November 24, 2024
[Feature Request] Password protected containers
Firefox Containers
12 6050 November 23, 2024
SEO Extensions
Add-on Support
seo
2 1371 November 10, 2020
Clicking on notification from MV3 extension has no effect if background script suspended
Development
8 228 November 23, 2024
Why is the backspace menu missing in Firefox Nightly
Firefox On Android
1 54 November 22, 2024
Firefox doesn't give me a stack trace on response details when using the Network Monitor tool
Developer Tools
3 110 November 21, 2024
Options.html (as popup) & file picker
Development
4 112 November 22, 2024
About:config missing
Firefox On Android
47 52553 November 22, 2024
Firefox Relay does not forward received emails
addons.mozilla.org
20 5263 November 21, 2024
Any Chance Tab Groups Will Ever Come?
Firefox Development
58 22372 November 21, 2024
What version of Android Firefox added support for MV3?
Development
2 117 November 20, 2024
Regional availability
Add-ons
2 105 November 20, 2024
We need an override for unsigned extensions in stable or a stable version of developer edition
Firefox Development
2 92 November 20, 2024
Happy BMO Push Day! (20241119.1)
Firefox Tooling Announcements
1 57 November 19, 2024
Community live stream event (Nov 20)
Announcements
2 159 November 19, 2024