It s happened twice today. Both times on different threads. It happens when I am scrolling with mouse wheel. I can use back button to get forum back. Not sure if it s my browser, or the webpage.
It’s never happened to me. Try disabling your add-ons to see if one of them is the cause of it?
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I agree. 
I was having a similar problem inside FireFox.
I disabled and uninstalled this one last week : (I was doing an experiment after having lagging issues with adblock plus.)
Installed µblock and the problem did not come back.
Not very scientific but hope this will help 
Never had this happen either.
I’m going to try to reproduce it.
I’ll be back.
Ok, 
I wasn’t able to reproduce the same problem I had and the one the O.P. has.
Current versions:
( noticed AdGuard AdBlocker has updated today the 28. )
Configurations:
- I disabled and uninstalled my previous Extensions. Cleared history cache, etc.
- Installed this particular one I had problem with; similar as O.P.
- Did some test around with web pages:
Maybe a different combination of extensions, software versions, updates, etc were causing the anomaly.
I realize the number of differences between systems is great. Maybe difficult to reproduce easily.
I will now go back to my normal extensions.
Try a fresh profile.
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