Error: Cannot access contents of url "chrome-extension://jffaiidojfhflballoapgofphkadiono/newTab.html#/". Extension manifest must request permission to access this host.

[arpit agrawal]

[woxxom]

Sounds like you're trying chrome.scripting.executeScript on your own extension's tab. It doesn't work in Chrome, intentionally so, because content script injection is only for websites. For your own page you can use messaging or embed small data as a URL parameter/hash when creating the page.