Sounds like they forgot to change it to use it's own config folders or something and it's sharing with Firefox which screws both up.
Firefox
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Well there is .floorp and .var/floorp for it's files, so I'm really not sure what they did, I suspect they left a few code calls to something Mozilla and that's where the problem lays
Is it running on Windows? Floorp devs should immediately fix the issue to avoid getting trouble with other Gecko browsers.
That's a weird one which I can't reproduce - Floorp and FF running happily together here.
If you still use r*ddit the dev is quite active and responsive there - /Surapuyousei. He may be able to offer a suggestion.
This is the second time I've tried Floorp, and a far bigger failure than last time.
Floorp shouldn't be considered honestly
In what way? It has some nice features that I'd like to see in Firefox after all