Hi! I’ve been trying to create an extension that deals with navigation but I’m getting an Uncaught (in promise) Error: Illegal URL: about:* for any action with these pages. Can anyone help me with this?
Well, I’m afraid I have only bad news.
Extensions can “work with” only with “about:blank”, everything else is blocked.
There is a plan to add support, but I wouldn’t hold my breath 
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Is there any ways to atleast set active on their tabs? Nothing seems to be working for them. Thank you for the response too!
If tab with “id” 79 is “about:addons”, then these operations will work fine:
await browser.tabs.update(79, {active: true})
await browser.tabs.update(79, {url: 'about:blank'})
Maybe post here what exactly are you trying to do?
I’m trying to create a custom tab view. Yes, this is working fine. I’m planning to add a URL bar to my extension, is there any way to allow for visiting the about:* pages from it?
None that I am aware of. As @juraj.masiar said, only about:blank can be accessed by an extension. See this note about the url property on the tabs.create() options object for more information.