Causes major slowdowns Rated 1 out of 5 stars

Normally it takes a fraction of a second to switch between tabs in Firefox, but if Operator is installed and the tab has heavy javascript, it takes 8+ seconds to switch between tabs and locks up the browser. It also conflicts with the RescueTime extension, making it extremely slow to Categorize Activities.

Unfortunately I have not had a chance to rewrite Operator to be more performant. As Firefox gets faster, Operator gets slower it seems.