How to merge 2 windows in Firefox

Question

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").

Solution 1

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.

Solution 2

For Firefox you have an extension:

• Merge-window

and for Chrome I'd been using for years:

• JoinTabs

Comments

[M Farkas-Dyck]

Yes, i have enough tabs open to make this inconvenient, so am hoping for a programmatic method to merge windows.

[M Farkas-Dyck]

Alas, merge-window merges all windows, not merely 2 given windows.

[fixer1234]

Hope you don't mind that I updated this for the new feature. It was already the right answer. :-)

[DrMoishe Pippik]

@fixer1234, Thanks for the edit. +1

[elMestre]

Yes, both of these extensions merge all tabs scattered trough all windows into a single window

[M Farkas-Dyck]

Thanks, the multiple selection works for me!