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	15784	September 30, 2025
About the Development category	0	4502	May 21, 2015
[EDITED] Error: Permission denied to access property "then" issue , manifest-v3	3	2094	November 2, 2025
A way to set tab context as default for new tab	1	34	October 30, 2025
Foucs behavior issue on sidebar when opening	1	19	October 29, 2025
Pin Tab Enhancement / Side Bar Control	2	289	October 25, 2025
[Manifest V3] background script stopped when signed extension is up	3	55	October 15, 2025
WebExtension API support for web app windows	3	83	October 10, 2025
IDEA - Add Unsubscribe Footer thunderbird	0	32	October 5, 2025
Validation says data_collection_permissions missing, but exists in manifest? issue	2	194	September 20, 2025
Do older Firefox versions ignore "data_collection_permissions"?	1	49	September 19, 2025
Do extension settings reference or depend on the extension's internal uuid?	2	24	September 19, 2025
Can we access location of new tab wallpaper?	2	35	September 15, 2025
License: This field, or custom_license, is required for listed versions	3	56	September 12, 2025
Error when use web-ext with chrome with `--keep-profile-changes`? issue	3	61	August 29, 2025
How to restore a recently-closed tab group via WebExtensions API	2	189	August 28, 2025
Does web-ext not load extension when use with Chrome? learning , issue	3	39	August 28, 2025
WebExtError when signing but still succeed? issue	1	31	August 25, 2025
What happens to storage when a user updates the extension? updates	1	47	August 17, 2025
Accessing closed tab groups	4	145	August 11, 2025
Deleting All Bookmarks in Folder (weird Fx bug?)	8	105	August 8, 2025
Any idea to create new window in correct position in 3200x2000 with 200% scale?	3	47	August 6, 2025
Where did `firefox-storage-test.glitch.me` go?	2	61	August 5, 2025
scripting.messageDisplay.registerScripts() are called twice?	5	75	August 5, 2025
How do you get type hinting for webext APIs in VSCode without using bundlers?	5	869	July 25, 2025
Dynamically adding elements to the updated sidebar	1	56	July 22, 2025
Firefox extension popup sometimes needs to be clicked on to detect keyboard inputs issue	2	58	July 22, 2025
Taking screenshots from the "chrome" context	4	69	July 11, 2025
Possible regression in `browserSettings.useDocumentFonts` API in recent browser versions? issue	5	77	June 27, 2025
Localy stored backups - altenrative soltuions	0	62	June 13, 2025

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…