Hi! Which OS is that?

Sorry, I should have specified that directly: Windows 10 Education 20H2.

What happens if you run this in Command Prompt:

wmic process where ProcessId=15968 get ProcessId,ParentProcessId,ExecutablePath /format:value

(replace 15968 with an id of any running process)

That's interesting. Now if you repeat the same in KeeWeb and run this command for a PID that you see in KeeWeb devtools - does it print the same information?

If I understood the instruction, here is the result. Maybe the first error message also has a meaning?

That's a bit different. I wanted you to run this in the command line, not in the devtools. But with the PID that you see in devtools.

No problem. I tried several times to connect the browser plug-in and put the respective PID displayed in the Dev Tools into the CMD, but only took a screenshot of it once, because the result was always the same.

That's interesting! Does a process with this PID exist in task manager?

No. The PID seen in the Devtools are not present in the Windows Task Manager.

Which browser is it?

Google Chrome 90.0.4430.212 64-Bit

Interesting, so it launches a process that disappears. We should probably show something like "an extension from unidentified app is trying to connect".
I wonder why this happens, it seems to be kind of edge case that happens in a specific setup. Anyway, the next version will have it fixed.

Thank You!

Fixed it, now if you upgrade KeeWeb, it should show "Unidentified browser"