I've been struggling with this problem for a while now. Maybe since my upgrade from 18.04 to 20.04.
It was very difficult to capture, but here is a video that shows that when the LinkedIn.com page is scrolled then the cursor is offset. It's very odd.
You'll see the cursor is activating the controls when it actually isn't over the control but is below the area. It's a very odd problem.
I believe I've discovered the problem.
Wrote a small script to print the cursor location while on that page.
I just opened the console and then pasted that in and then began examining the x,y values.
Ha, but that wasn't the solution. I scrolled up in the console and saw the following error message given by FireFox:
FireFox Console
[-- This page uses the non standard property “zoom”. Consider using calc() in the relevant property values, or using “transform” along with “transform-origin: 0 0”. www.linkedin.com --]