By resolution, do you mean the window dimensions?
this post was submitted on 14 May 2024
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Exactly
I'm going to need details
Are you on Windows? If so hold shift while closing the window and it will remember the size and position next time.
No, I am on linux
It should remember by default. If you are on Plasma, you can do a temporary fix by creating a window rule for firefox and tell it to remember it's size.