I am uploading my first Opera Extension. It is very simple. It is a toolbar button that launches a popup window. It works perfectly fine in Opera developer mode. Opera is not letting me upload it s...

I'm talking about Chrome extensions, Firefox WebExtensions, Edge extensions... In a background script, not a content script, is there a clear way to know which browser I am using? I need to do dif...

I'm developing an extension which will perform a certain action on all Google search URLs - but not on other websites or Google pages. In natural language the match pattern is: Any protocol ('*:/...

I'm using getAll() method to get all items from db. db.transaction('history', 'readonly').objectStore('history').getAll().onsuccess = ... My ObjectStore is defined as: db.createObjectStore('his...

the new guy here. I've been looking for a good solution to using Stylus (compiled CSS) client side. Now, I know the tips regarding not using compiled CSS client side because: It breaks if JS is ...