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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…

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How to create a theme that can alter most of the colours in thunderbird
Add-ons
learning
1 14 December 22, 2024
Way to view current sync data outside of Firefox
Firefox Development
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Downloading a webpage
Learn
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Third level domain ssl certificates acceptance
Common Voice
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New way to gather money, thanks AI?
Mozillians
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Raspbian 10 buster
WebThings
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Browser.tabs/browser.windows undefined
Developer Tools
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Virtual event Dec 19 - Pontoon 2024 highlights and more!
Localization
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Common Voice Toolbox: Beta testers and feature requests needed
Common Voice
feedback ,  tooling
14 2606 December 19, 2024
How to enable console.log from Service Worker?
Developer Tools
11 2926 December 18, 2024
Lost Access to 2FA Device and Backup Codes
Add-on Support
2 107 December 18, 2024
AI Password recovery not showing up
Common Voice
learning ,  issue
1 74 December 17, 2024
Unnecessary and annoying prompt + bug
Firefox Containers
2 996 October 16, 2022
Problem with maked containers name
Firefox Containers
issue
1 533 May 12, 2023
Automatic activation of tel: protocol association to an application
Developer Community
1 467 January 11, 2024
Jan Doe | Excercise
Learn
learning ,  feedback
1 684 October 30, 2023
Add Extensions
Common Voice
1 62 December 16, 2024
How can I change the color theme of Truthsocial.com on Firefox?
Development
2 140 December 16, 2024
How to import npm packages in content script in an extension?
Development
5 206 December 16, 2024
Is it possible to make a CLI for your browser extention?
Development
2 156 December 16, 2024
Trouble using TB Addon Developper site to change support email and website for an addon I created
Add-ons
1 279 December 16, 2024
Register as a Mozillian
UK
gb-opportunity
5 1152 September 17, 2018
How do we turn off the outlines round every element we interact with when devtools is open?
Developer Tools
feedback
7 1854 December 16, 2024
How to use browser polyfill for MV3 cross-browser web extension
Add-on Support
1 127 December 14, 2024
Bem-vindo a comunidade Mozilla Brasil
Brazil
42 5634 December 14, 2024
Sanctions against countries changing terms to license
North America
1 144 November 9, 2024
WebVR 中文新鮮報 vol.9 (2017/06/26)
WebVR (Chinese 中文)
1 1122 June 27, 2017
Install an unlisted extension in Firefox Android
Firefox for Android Add-ons
2 352 December 13, 2024
Firefox Profiler Deployment (December 12, 2024)
Firefox Tooling Announcements
firefox-profiler
1 90 December 12, 2024