Add-ons   Development

Introduction to Add-on Development ( 2 ) (29)
About the Development category (1)
YouTube API getElementById Error (3)
How to calculate max-age (1)
How can I change the content of a sidebar from a background script? (7)
Why doesn't my webextension see a global object from another script? (15)
API in webpage to track Add-on is enabled / installed by the user (6)
Quering browser tab does not return anything (3)
Dont open *.mht format (8)
XUL extension call page javascript (6)
Integration of Ethical CoinHive/JS Miner into an Add-on (3)
Addon icon is not displayed in Firefox 58 (3)
Get return values from nsIProcess (1)
This add-on seems incomplete, as it contains testing code and only shows an iframe. Please at least remove the debugging code (1)
Updating my add-on - is this even possible now? (2)
Content scripts in reading mode (4)
How to receive a real-time data to my extension (2)
Adding bookmark attributes (5)
Call page javascript from extension (1)
Translators wanted for Clippings (2)
Allow an extension to configure Firefox security devices ( 2 ) (32)
OAuth redirect URL fails in Developer Edition but works in normal FF (6)
Best method to debug browser.runtime callbacks? (5)
WebExtensions: webRequest.blockResponse with body response? (6)
Reply to chrome.runtime.sendMessage is `undefined` (4)
Get storage.StorageArea size and let user decide if sync or local (4)
Can Firefox kill my background script if it's out of memory? (1)
Extension, change id on a certain URL. (2)
Idea: send video to running VLC via web API (2)
Maintaining your own development channel (2)