Thanks for the details, people - very helpful.
and I just HAD to say something
I just got the dead X at the top instead of the refresh arrow/circle thing.
Just tried this but it still doesn't work for me under Firefox Quantum 32 biti changed one setting in
about:config
apz.frame_delay.enabled;true
Double click it to change it back to false which was the setting in Firefox 56. The forum slows down slightly but the back button works on the first try now under Firefox Quantum 57 64bit
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It did work with the 5 or 6 clicks but it's back to working with just oneIf the back button doesn't work a refresh will usually make it work and also try 5-6 clicks because sometimes that works!