This is probably too late for anybody to notice but I got FF memory usage down significantly by: 1) Not using the recommended performance settings. Setting 'C

This is probably too late for anybody to notice but I got FF memory usage down significantly by: 1) Not using the recommended performance settings. Setting 'Content Process Limit' to 2 removed more than half the memory usage IIRC. There are other settings that you will need to go to about:config to change like what size images are cached to memory etc. 2) Use the 'Auto Tab Discard' extension. You will have to configure this to not discard tabs on certain sites or you may lose info you have typed into a webpage. Fortunately this is easily configured by right clicking a tab. At the moment Firefox is using 700MB to display 5 tabs. 4 HN and on Reddit tab. Given that these sites are close to just text I find 700MB absurd, but that is just the web these days.