Add-ons   Development

Introduction to Add-on Development ( 2 ) (30)
Extension development tools (4)

Hi all, I’m excited to share some tools that community members have recently created to help with extension development. If you’ve built something that could be helpful to others, please let us know by replying to this …

About the Development category (1)
On-line detection - detect working internet access (2)
WebExtension - storage.local.clear() don't work (3)
Local Storage Debugger Workaround (7)
AMO approved add-on fails to install (6)
WebExtension with Native messaging C++ App side (3)
Downgrade from Firefox 63 clears local storage of all add-ons (8)
WebExtension APIs made as getter/setter, lazily evaluating to functions – Beware of mocking for unit tests! (3)
How to create a menu with underscore as key binding/accesskey? (5)
Question about addon signing (4)
browser.devtools.panels.elements.createSidebarPane not working on Nightly (1)
How to use a google map api in a Firefox extension, if Firefox prohibits the attenuation of the CSP (3)
[SOLVED] Both content_scripts all_frames true or false not working on top document (5)
Error: There is a JavaScript syntax error in your code; validation cannot continue on this file (6)
Is it possible to develop a paid extension? (6)
URL "about:newtab" still shows default and not custom new tab (6)
ES6 modules and Firefox debugger? (1)
How to trap extension disable of uninstall (on Firefox)? (3)
Youtube redirecting on Drop event (1)
Permission denied when trying to set cookie in a firefox web extension on a local file (6)
IndexedDB in Containers - contextualIdentities (3)
Where can I get help to debug an extension (4)
How to add fonts in JS file? (5)
Collect infos on all iframes of current page? [SOLVED] (4)
Background script / extension page during add-on upgrade (11)
[SOLVED] Error from native messaging app: "Win error 5 during operation open on file C:\Users\...\native-msg-demo (Access is denied.) (2)
Can Firefox kill my background script if it's out of memory? (8)
Firefox Extension: newtab scripts (2)