Finally found a solution for an annoying bug in @thunderbird:
The Calendar in Mozilla #Thunderbird 140.6.0esr on Ubuntu 24.04.3 LTS
scrolls way too fast & erratic using a mouse. Both in the main calendar as well as the small calendar view in the sidebar. Touchpad is fine.
The solution: disable 'smooth scrolling' in Edit --> Settings (search for 'smooth scrolling')
