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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 12960 September 6, 2023
Top APIs missing on Firefox for Android?
Firefox for Android Add-ons
20 3519 December 26, 2024
Large number of pages don't open properly
Firefox Development
2 19 December 25, 2024
Firefox Add-on Rejected as SPAM — Looking for Feedback
Development
feedback
1 41 December 25, 2024
Broken UI on Wiki
Mozillians
5 555 December 24, 2024
Can no more force extensions on users using directory distribution/extensions
Security
3 663 December 24, 2024
New way to gather money, thanks AI?
Mozillians
2 70 December 24, 2024
Missing icons, screenshots, and more
Add-on Support
4 222 December 23, 2024
How to create a theme that can alter most of the colours in thunderbird
Add-ons
learning
1 61 December 22, 2024
Way to view current sync data outside of Firefox
Firefox Development
3 135 December 22, 2024
Downloading a webpage
Learn
2 114 December 22, 2024
Third level domain ssl certificates acceptance
Common Voice
1 46 December 22, 2024
Raspbian 10 buster
WebThings
5 152 December 20, 2024
Browser.tabs/browser.windows undefined
Developer Tools
issue
3 92 December 20, 2024
Virtual event Dec 19 - Pontoon 2024 highlights and more!
Localization
2 115 December 20, 2024
Common Voice Toolbox: Beta testers and feature requests needed
Common Voice
feedback ,  tooling
14 2630 December 19, 2024
How to enable console.log from Service Worker?
Developer Tools
11 2988 December 18, 2024
Lost Access to 2FA Device and Backup Codes
Add-on Support
2 133 December 18, 2024
AI Password recovery not showing up
Common Voice
learning ,  issue
1 99 December 17, 2024
Unnecessary and annoying prompt + bug
Firefox Containers
2 1007 October 16, 2022
Problem with maked containers name
Firefox Containers
issue
1 545 May 12, 2023
Automatic activation of tel: protocol association to an application
Developer Community
1 475 January 11, 2024
Jan Doe | Excercise
Learn
learning ,  feedback
1 712 October 30, 2023
Add Extensions
Common Voice
1 77 December 16, 2024
How can I change the color theme of Truthsocial.com on Firefox?
Development
2 163 December 16, 2024
How to import npm packages in content script in an extension?
Development
5 229 December 16, 2024
Is it possible to make a CLI for your browser extention?
Development
2 176 December 16, 2024
Trouble using TB Addon Developper site to change support email and website for an addon I created
Add-ons
1 378 December 16, 2024
Register as a Mozillian
UK
gb-opportunity
5 1161 September 17, 2018
How do we turn off the outlines round every element we interact with when devtools is open?
Developer Tools
feedback
7 1876 December 16, 2024