Communicate between isolated worlds (extension js and webpage js) on chrome extension

Question

As you may know, js files on chrome extensions and pages cannot directly access each other and they run on isolated worlds.

However, I want to access some of the fun

Answer 1

Assuming you know the tab ID of the page whose function you want to call, you can use chrome.tabs.update(tabId, {url: 'javascript:functionNameHere()'}); from your extension page. This works because javascript: URLs are mapped to script execution in the main (i.e. page, not isolated) world.