If in some websites their drop-down menu doesn’t work, you can check if you have enabled (in that websites) the “Absolute enable right click” extension, that can interfere heavily with javascript. Try to disable it, and you can see if that was the problem.
Thunderbird – Whatsapp problem
There are (several) extensions of Thunderbird that allow you to use Whatsapp on your PC, as you can see in the image below.
If you have a problem of “space on disk”, causing the disconnection from Whatsapp, you could try to find and destroy the cache of TB Whatsapp (a folder called web.whatsapp.com or something like).
I was able to solve this problem in this way.