Middle click is performed by mouse left click if I am accidently resting thumb and finger on trackpad

[tberghuis]

I have the number of fingers set to 2. defaults write art.ginzburg.MiddleClick fingers 2
When I left click with a mouse but have my left hand thumb and finger accidentally resting on the trackpad, a middle click action is performed. This leads to accidentally closing browser tabs and windows.

So I guess to fix you would need to filter out (exclude) click events from real mouse.