So why does firefox need to have so many processes opened for one tabbed window for a single tab? 3 Years later and this is still broken. I have a win10 with 16gig ram and have found the system slowing down look at the task list and will find Firefox with 18gig of the memory and 90% of the cpu. I have 9 tabs open to different sites but will see 30 firefox processes open. At initial boot of FF only 9 to 10 processes open but the longer it stays open the more memory and processes it consumes just like a BOT virus would. Why has this not been resolved? Once the process shown a single with 1 gig memory just itself but many times the memory is spread out across multiple processes from half a meg to 500 meg per process.