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").
Easiest might be just to drag-and-drop tabs from one instance of Firefox onto the other. That gives you control of which tabs to move and in what order they appear.
A multiple tab selection feature was added to Firefox in version 64. If you have a large number of tabs to move and want to do it in bulk, select the first tab, then shift-select the last tab to select the entire range (you can also Ctrl-select individual tabs to create a collection of selected tabs). Then drag the lot to the other window. So moving all tabs from one window to the other can be done with three mouse clicks.
