Development

Topic	Replies	Views	Activity
Get started with Firefox extension 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	18981	August 15, 2026
About the Development category	0	4603	May 21, 2015
How to detect / identify PWA (web apps) windows?	0	18	August 13, 2026
Is it possible to modify the context menu display name for a dictionary? learning	0	33	July 19, 2026
Why malicious extensions get deleted "silently" ? how about transparent "Tombstone" pages instead feedback , issue	2	125	July 17, 2026
_paranioa_allocator_ virus mozilla subprocess insecure. offering solutions issue	0	31	July 16, 2026
Does a "Reading manifest" warning prevent install/update for regular users? (data_collection_permissions for ESR 115)	4	78	July 14, 2026
AMO won't let me re-upload version 2.9.3 after I deleted my previous 2.9.3 upload, and I can't delete the whole extension to start over issue	1	58	July 13, 2026
Mozilla Review Delays Preventing My Self-Distributed Extension Registration add-on-reviews	2	91	July 1, 2026
[Feedback] VoxSub – a Firefox add-on for dual subtitles, AI translation, and subtitle control webextensions-api , feedback	8	264	June 25, 2026
Requesting `file:///*` permission dynamically via `browser.permissions.request()` webextensions-api , permissions	1	103	June 24, 2026
You should make a "How to make an extension" video for vibe coders	3	109	June 22, 2026
Locked Dashboard: Clarification on False Positive (UUID: b0dd6398-1c58-4940-b0be-3577cd03b723) add-on-reviews	2	54	June 15, 2026
YouTube embed in extension no longer possible?	0	62	June 11, 2026
Cannot load extensions with background scripts	5	5170	June 8, 2026
[Showcase] Building a Global Media Controller for Firefox (Proof-of-Concept) learning , gb-media , webextensions-api , issue , manifest-v3	2	91	May 23, 2026
Extensions panel uses wrong themed icon colour	0	35	May 19, 2026
Problem with internationalisation management learning	10	126	May 6, 2026
Appeal: RavenWallet removal was triggered by coordinated fake review attack	8	122	April 29, 2026
Add-On code help	1	68	April 25, 2026
Strongly recommend adding hook native JavaScript function functionality feedback , issue	1	78	April 23, 2026
Add-On Removed and account Banned issue	1	113	April 21, 2026
How to attach cookie to request?	2	84	April 21, 2026
UnknownError: The operation failed for reasons unrelated to the database itself and not covered by any other error code	0	67	April 19, 2026
Testing an add-on on restart	2	62	April 12, 2026
Why I can't see the content script when I debug the addon?	12	8826	April 11, 2026
[Firefox MV3] Any plan to support scripting eval in "sandbox"? manifest-v3	2	90	April 6, 2026
About:addons icon source	0	56	March 30, 2026
Unexpected tab group auto-joining behavior after `browser.tabs.move` call issue	3	113	March 5, 2026
Host permissions lost on extension upgrade of enterprise installed extension	0	48	February 23, 2026

Get started with Firefox extension 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…