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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 10534 September 6, 2023
Frequently Asked Questions (Portal Edition) - FAQ
Community Portal
24 25585 April 19, 2024
Localization Fireside Chat: let us answer your questions!
Localization
1 18 April 18, 2024
Mozilla Swag Store is now open
Mozillians
6 3002 April 18, 2024
tabs.executeScript does not work with containered tabs
Development
issue
3 41 April 18, 2024
Happy BMO Push Day! (20240417.1)
Firefox Tooling Announcements
1 23 April 18, 2024
Regarding our add-on rejected by mozilla team
Add-ons
issue
6 105 April 18, 2024
Save and restore entire container state?
Firefox Containers
1 19 April 18, 2024
Upgraded add-on signatures
Announcements
1 37 April 17, 2024
Keeweb connect suddenly disappeared from the add-ons browser
Add-ons
5 113 April 17, 2024
Add-ons submissions help needed
Add-on Support
1 42 April 17, 2024
免费分享稳定vpn梯子工具，便宜好用的翻墙机场推荐
WebVR (Chinese 中文)
1 38 April 17, 2024
翻墙机场推荐丨翻墙梯子推荐丨稳定好用便宜的手机电脑vpn
WebVR (Chinese 中文)
1 55 April 17, 2024
Shortcomings of Firefox themeing modules, many elements can't be themed or updated
Themes
1 42 April 17, 2024
Someone published copies of my add-on on AMO
addons.mozilla.org
46 1738 April 17, 2024
Widevine addon is crashing
Add-on Support
3 241 April 17, 2024
Bookmarks bar is too narrow
Themes
learning ,  feedback
2 176 April 17, 2024
Custom theme light and dark
Themes
2 457 April 17, 2024
Add-on getting rejected on submission
Add-on Support
2 201 April 16, 2024
Firefox exceptionally slow compared with Chrome
Firefox Development
issue
6 1176 April 16, 2024
Python "native-messaging" web extensions on mac unable to read / write files on Downloads folder
Development
webextensions-api
2 724 April 16, 2024
Which policies apply to AMO-listed addons vs. self-distributed addons?
addons.mozilla.org
11 689 April 16, 2024
Firefox doesn't virus check downloads with Microsoft Windows Defender?
Firefox Development
2 63 April 16, 2024
Sentence collector copyright issues
Common Voice
sentence-collection
55 4737 April 16, 2024
Solicito evaluacion para la prueba de habilidad de texto básico HTML 1 - AC1DER
Learn
1 40 April 16, 2024
Addon/function that reads out emails, Text To Speech?
Add-ons
12 1476 April 16, 2024
Dictionary with wrong name in the addons page
addons.mozilla.org
3 184 April 16, 2024
Is this code safe?
Common Voice
issue
3 57 April 16, 2024
Giving progress notification after EVERY 5 listened sentences is annoying
Common Voice
5 393 April 16, 2024
Inaccurate results from 0.9.3 model
Common Voice
learning
2 42 April 16, 2024