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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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Third level domain ssl certificates acceptance
Common Voice
1 5 December 22, 2024
Way to view current sync data outside of Firefox
Firefox Development
2 74 December 22, 2024
Downloading a webpage
Learn
1 23 December 22, 2024
New way to gather money, thanks AI?
Mozillians
1 21 December 21, 2024
Raspbian 10 buster
WebThings
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Browser.tabs/browser.windows undefined
Developer Tools
issue
3 44 December 20, 2024
Virtual event Dec 19 - Pontoon 2024 highlights and more!
Localization
2 89 December 20, 2024
Common Voice Toolbox: Beta testers and feature requests needed
Common Voice
feedback ,  tooling
14 2604 December 19, 2024
How to enable console.log from Service Worker?
Developer Tools
11 2925 December 18, 2024
Lost Access to 2FA Device and Backup Codes
Add-on Support
2 98 December 18, 2024
AI Password recovery not showing up
Common Voice
learning ,  issue
1 66 December 17, 2024
Unnecessary and annoying prompt + bug
Firefox Containers
4 992 December 17, 2024
Problem with maked containers name
Firefox Containers
issue
2 533 December 17, 2024
Automatic activation of tel: protocol association to an application
Developer Community
2 466 December 16, 2024
Jan Doe | Excercise
Learn
learning ,  feedback
2 682 December 16, 2024
Add Extensions
Common Voice
1 59 December 16, 2024
How can I change the color theme of Truthsocial.com on Firefox?
Development
2 135 December 16, 2024
How to import npm packages in content script in an extension?
Development
5 199 December 16, 2024
Is it possible to make a CLI for your browser extention?
Development
2 149 December 16, 2024
Trouble using TB Addon Developper site to change support email and website for an addon I created
Add-ons
1 254 December 16, 2024
Register as a Mozillian
UK
gb-opportunity
9 1151 December 16, 2024
How do we turn off the outlines round every element we interact with when devtools is open?
Developer Tools
feedback
7 1852 December 16, 2024
How to use browser polyfill for MV3 cross-browser web extension
Add-on Support
1 120 December 14, 2024
Bem-vindo a comunidade Mozilla Brasil
Brazil
43 5633 December 14, 2024
Sanctions against countries changing terms to license
North America
2 144 December 14, 2024
WebVR 中文新鮮報 vol.9 (2017/06/26)
WebVR (Chinese 中文)
2 1122 December 14, 2024
两款翻墙机场梯子推荐，SSR/V2Ray/Torjan节点订阅
WebVR (Chinese 中文)
1 414 December 14, 2024
Install an unlisted extension in Firefox Android
Firefox for Android Add-ons
2 330 December 13, 2024
Firefox Profiler Deployment (December 12, 2024)
Firefox Tooling Announcements
firefox-profiler
1 90 December 12, 2024