I just discovered that you can pin tabs, which means that they are always loaded when you open firefox. This is a game changer for me. Whenever I open firefox, all my most visited tabs are automatically loaded and there’s no loading time anymore. Of course I still need rules for cookie autodelete but it’s awesome!

However, they disappear and are not loaded anymore if you have multiple Firefox windows open and the window with the pinned tabs is not the last Firefox window one you close…