For the last couple of years I have been plagued by three major Firefox issues which I think now are inter-related - the first is a HUGE amount of memory being use (around 1.5-3.5GB in a 6GB machine), the second is firefox suddenly becoming slow and crashing. The third is that neither of my microsoft email accounts (MS live/Outlook nor my work-based Outlook365) load after restarting firefox from a crash. In detail 1. Upon launching firefox, memory usage quickly increase to around 1.5gb, with maybe one or two pages open. This gradually increases to the extent it is throttling my machine and preventing other programs working properly (Windows Explorer being the most regular to be booted off and restart when this happens). I've recently noticed that there are about 10-15 parallel firefox processing running. Killing the largest memory-using instance someimes does nothing except free up memory, sometimes causes tabs to crash (with the stupid 'gah your tabs have crashed' displaying), and sometimes kills the whole program - there is no way to know what each instance is actually doing in task manager, so its pot luck. However I am noticing that quite often force stopping 'high memory process' manages to kill one or both my email pages. 2. Normally when memory use is high, forefox becomes very slow. At this point, either it, or another running program with crash. I'm quite sure this is because firefox is consuming so much memory that neither it, nor other programs can run properly and a crash occurs. 3. When I restart firefox (either a forced restart or a crash), and restore my tabs, almost every time, neither of my microsoft email services load. They just hang in a loading state, or a loaded state, but with a white page displaying. I suspet the pages are loaded, but firefox for whatever reason is not displaying them. After anywhere between 10 and c.60 minutes (it it totally random) pressing refresh finally allows the page to load. This is coming from a clean restart of firefox where all previous instances have been force stopped. Sometimes Firefox has even installed updates on itself (which I would have thought clears all previous running versions). In the mean time I can load my email in private mode (which is annoying as I have to sign in each time). I have tried starting firefox in safe mode, clearing cache etc and it does nothing to help microsoft email services launch straight away. The only work around is to use private browsing. I'm gradually coming to the conclusion there is something in the way firefox works with microsoft's email web displays that does not work. This is either MS fault or Mozilla. But either way what is the fix? And please don't say 'its good firefox is using otherwise unused memory (a previous argument I stumbled across). This is a rediculous argument if firefox memory use prevents it and other programs from operating properly. HELP! I'm shortly to get a new machine and am tempted to say goodbye to Firefox forever (after about 15 years of use) as it is getting unworkable. Currently running v.90.0.2 (64 bit) Thanks