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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 12012 September 6, 2023
Browser extension storage "get" return value if nothing found
Development
3 86 October 4, 2024
Will linking to .xpi preserve user tracking?
Add-on Support
1 8 October 4, 2024
Stuck awaiting review
Add-on Support
4 32 October 4, 2024
Firefox built-in translator translates input element values
Developer Community
issue
1 18 October 4, 2024
An Important Update on Mozilla WebThings
WebThings
15 151811 October 4, 2024
Why are we no longer able to flag very bad ratings
addons.mozilla.org
18 926 October 4, 2024
FireFox uses 80% of my Ram
IAM
2 51 October 4, 2024
What is the best way to automatically test the functionality of addons (eg for Github Actions)
Add-ons
2 102 October 3, 2024
Content security policy blocking injecting styles into pages
addons.mozilla.org
2 56 October 3, 2024
Addon has been disabled
Add-on Support
3 53 October 3, 2024
How to keep the same internal UUID by installing a Firefox add-on in unlisted mode?
Add-ons
2 64 October 3, 2024
Add-on Review Questions
addons.mozilla.org
add-on-reviews
150 15745 October 3, 2024
How to Programmatically Configure FoxyProxy(Extension) in Firefox on Launch?
Add-on Support
1 22 October 3, 2024
Reinstating the Language Representative Program
Common Voice
7 351 October 3, 2024
Common Voice Toolbox: Beta testers and feature requests needed
Common Voice
feedback ,  tooling
13 1979 September 20, 2024
Need help for social media project development
Learn
1 31 October 2, 2024
Can Thunderbird show only newly received emails instead of all unread emails?
Thunderbird
1 33 October 1, 2024
LocalStorage UUID disappearance
Developer Community
issue
2 350 October 1, 2024
Firefox specific Cross-Origin Request Blocked
Firefox Development
issue
2 54 October 1, 2024
Opportunity to contribute to multi-accounts containers
Add-ons
2 191 October 1, 2024
[FEEDBACK REQUEST] MV3 Developer Survey
Announcements
feedback
1 62 October 1, 2024
Firefox Mac With Cloudflare Fail
Security
1 52 October 1, 2024
Gecko core & firefox broswer compatible with the HarmonyOS Next system
Firefox Development
participation ,  sentence-collection ,  feedback ,  issue ,  privacy-and-security
1 39 October 1, 2024
Top APIs missing on Firefox for Android?
Firefox for Android Add-ons
17 3087 September 30, 2024
Unwanted disable of the extension PUPSIS-Schedule-Exporter
Add-on Support
4 129 September 30, 2024
Mozilla Etherpad is getting decomissioned
Mozillians
3 168 September 30, 2024
Self Hosted Addon approved but still unverified
Add-on Support
2 59 September 30, 2024
I can't download the xpi for an self-distribution extension
Add-on Support
4 158 September 30, 2024
To set a custom website, like animeflv.com.pl, as the New Tab page in Mozilla Firefox
Español (es)
issue
1 62 September 30, 2024