Add-ons   Development

Extension development tools (4)
Introduction to Add-on Development ( 2 ) (29)
About the Development category (1)
Is there any way to generate notifications, from an extension? (8)
Make addressbar text "Extension (Name Of The Extension)" shorter or hide (5)
Injecting content scripts in existing pages (1)
Customize Firefox ESR (Pre Configured) (4)
[Solved] WebExtensions - Not compatible with Firefox Quantum ( 2 3 ) (45)
How to use highcharts in content script (6)
Re: Does get/setWindowValue persist across browser restarts? (1)
Can add-ons/WebExtensions popups determinate whether they are shown in the overflow menu or not? (3)
Context of inline image requests in extension page (e.g., a popup)? (6)
How to figure out when injecting a content script would fail? (18)
Add Always on Top to Firefox Quantum (7)
Get HTML of remote page with JS ( 2 ) (25)
Sidebar question (2)
Network request not visible from the addon debugging toolbox (3)
Content scripts and websocket (5)
Submit data via jquery post to another website (3)
Can someone develop a plugin / addon to save different sessions (groups of tabs) (5)
Application/pdf XPCOM stream converter registering but not activating (1)
Does get/setWindowValue persist across browser restarts? (1)
How to correctly design/color icon to be visible across themes? (9)
Review Request for my tabs filter extension (1)
Creating a web-extension i18n tool ( 2 ) (31)
No way to detect that a window or tab is closing before it's closed (17)
Handle shortcuts with NumPad in background (6)
How to make an extension for android firefox, from which make appear a toolbar? (6)
URL "about:newtab" still shows default and not custom new tab (2)
Enable/disable chrome_url_overrides programmatically (10)