Add-ons

Add-on Support Need help with an add-on? Ask here! Themes Discussions about background themes and complete themes. Firefox for Android Add-ons This space is specifically for developers with technical questions as they prepare their desktop add-ons for availability on Android. Contribute Help keep Firefox the most customizable browser available. Contribute code, organize events, translate things, evangelize, and more. addons.mozilla.org Discussions about AMO add-on reviews and bugs. Announcements Important announcements for the add-ons community. Development Technical discussions about add-on development.

Topic	Replies	Views	Activity
About the Add-ons category Add-ons	0	24843	July 11, 2014
Best practices for content script message passing with Manifest V3 in Firefox Development	1	10	September 7, 2026
How to detect / identify PWA (web apps) windows? Development	2	50	September 7, 2026
How... do addon slugs work? addons.mozilla.org issue	15	70	September 7, 2026
I applied for an API key on the Mozilla website for Firefox add-on development, but after submitting the application, I have not received any email and cannot see my API key Add-ons	9	147	September 7, 2026
Extension review pending for 19 days - IMC TOOL v1.1.1 Add-ons issue , add-on-reviews	0	17	September 6, 2026
Request to release unused AMO slug stockblocker Add-on Support	4	62	September 4, 2026
Unable to access existing AMO account and add-on ownership Add-on Support	2	46	September 3, 2026
New Mozilla Account cannot access AMO Developer Hub Add-ons	2	21	September 3, 2026
Beta testing request — MixStūra Video Downloader Add-ons	2	37	September 2, 2026
Question About Distribution Methods and Automatic Signing Add-ons	4	43	September 2, 2026
Unify Extension Toolbar Button Behavior Between Home Screen and Normal Pages Firefox for Android Add-ons	2	31	September 2, 2026
Add-on approved but public page returns 404 (not showing in search) Add-on Support	2	39	September 1, 2026
Disabled for "Deceptive or misleading" after our first data_collection_permissions declaration. What is the right path forward? addons.mozilla.org issue	2	37	September 1, 2026
Requesting file-size validation exception — unlisted add-on with 3 JS files over 5 MB Add-ons	1	42	September 1, 2026
Unable to sign into account on Mozilla Addon site Add-on Support	1	40	September 1, 2026
Why is my absolutely legitimate email not allowed to submit add-ons? addons.mozilla.org	1	30	September 1, 2026
Pending review since 10 Aug Add-on Support	3	119	September 1, 2026
Cannot Post Review Add-ons	4	69	August 27, 2026
Add On Awaiting Review for 12+ hours Add-on Support	1	54	August 26, 2026
Add-on API key request email rate limit Development issue	1	39	August 26, 2026
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…	7	19166	August 26, 2026
Field report: shipping an MV3 YouTube extension — 10 traps the docs don't tell you addons.mozilla.org	0	46	August 25, 2026
My Add-On has been stuck in awaiting review. Please help addons.mozilla.org	1	46	August 24, 2026
Addon stuck in review for weeks addons.mozilla.org	5	106	August 24, 2026
Staging an Addon Version Update Add-on Support	2	59	August 24, 2026
Cant download add-on to PC Add-ons	1	47	August 23, 2026
Addons.mozilla.org is returning HTTP 503 – Backend.max_conn reached when accessing the Firefox Add-ons application addons.mozilla.org	4	227	August 20, 2026
Is there an Api for publishing Extension? addons.mozilla.org	1	42	August 20, 2026
Add-On Review time Add-on Support	3	99	August 18, 2026