When I open Firefox with many tabs, my Linux machine becomes slower, and in "top" I see a process named "Web Content" which takes a lot of RAM and CPU. I guess it is related to tabs running process in the background with Javascript, e.g. Gmail or Outlook checking for new mail.
A. Is there a way to see exactly which tab takes uses the most CPU/RAM?
B. Is there a way to tell Firefox to stop running the background processes in a certain tab (while keeping the tab open)?