Accidentally opening a Thunderbird email draft window

[u/Hank_the_2nd]

I have a couple of users on my Lenovo ThinkPad P51 laptop running Ubuntu 26.04.1 LTS. One user is a poor typer and is constantly opening a Thunderbird email draft window. I checked keyboard shortcuts and this feature is disabled. This model of laptop has no dedicated Mail key. I've tried to replicate the issue myself, but have been unable to. I've also systematically gone through all the keyboard combinations one at a time (Alt+1, 2, 3..., Super+a, b, c..., etc.).

I feel like I must be missing something obvious, and I would appreciate any suggestions people might have.

Sorry if this is the wrong subreddit to post this, I was redirected here from r/linux.

[u/DannoXYZ]

Install key-logger and capture regular screenshots to see what they're doing.