Offscreen document and user profiles

[Timur Allamiyarov]

Hello fellow devs!

I am currently developing an MV3 extension that utilises an Offscreen Document. It seems that when I log in as user A (who has the MV3 extension installed) and close their browser window, then log in as user B, the latter will experience a loss of internet connection. 

Interestingly, this problem does not occur if the Offscreen Document is closed before closing the browser window. I am using version 126.0.6478.61 of the Chrome browser.

Has anyone else encountered this issue? Is there a foolproof method to programmatically close an Offscreen Document when a browser window is closed?

[woxxom]

There's a bug in Chrome (extension processes aren't terminated when profile's last window is closed), https://crbug.com/41226999, but it should be fixed since Chrome 100 by default and I can't reproduce it here in Chrome 125 and 128.

• Maybe you have some windows still open like devtools
• Maybe your manifest.json has "permissions":["background"]
• Maybe DestroyProfileOnBrowserClose is disabled in chrome://version/?show-variations-cmd

Either way you can probably use chrome.windows.onRemoved to detect this situation and close the document accordingly.

[woxxom]

If I'm not mistaken, DestroyProfileOnBrowserClose may be still disabled for some users via Chrome's field trials, so try exiting all Chrome processes and start it with --enable-features=DestroyProfileOnBrowserClose command line.