After 72.0.2 I started to notice performance problems with my firefox. Symptoms are similiar to my multiprocess problems I had after it was added. I managed to avoid it for some time by limiting processes number to 1 (which was 4 in reality) Long story short: when you open new tab firefox has to create new process which is somewhat correlated to your PC performance (however it hangs up even on 4800MHz i5 with nvme pci-e 3.0 x4 ssd so....). When this process is already created and you enter different website it is smooth - firefox does not have to create another process until you open NEW TAB or it reaches its limit (from 1 to 8 processes/tabs) - set via settings. If limit was set to more than 1 I had problems with hanging up for few seconds until I reached limit - so if it was set to 4 I opened 1 tab and 3 links I clicked (with new tabs) slowed firefox down for me, but 4th, 5th etc. were fine. So I set it to 1 permanently and problem disappeared - every tab opened as fast as before. But now problem seems to have returned. I still have 1 in my settings but symptoms are pretty much the same (but there are only 4 processes). However browser is not hanging up - it seems like connection is. It does nothing - "waiting for xxxxxx" in lower left corner and then after 1-2s page actually starts to load. It is present on every website I visit, no matter how many tabs or windows I open. So my question is - what did you break in this firefox version? Previously it was youtube, now it is all sites...