With many add-ons installed as well as many tabs opened, Mozilla Firefox can consume a lot of memory. A detailed breakdown about which add-ons are using the most memory and how much is used by Firefox itself can be a good metric to have. A simple add-on does exactly this. (An add-on to check the memory usage of add-ons 🙂 ). This is “about:addons-memory“. Download and install it from...