How can i merge 2 windows in Firefox Quantum, i.e. move all tabs of these 2 windows to 1 window?
I have many Firefox windows open and want to merge 2 of them. So far Web searches merely turn up extensions like these (1, 2) which seem to merge all windows. I have been looking at the API docs but can't figure out how to use these functions from the script console (it says "ReferenceError: browser is not defined").