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").

I [requested this feature](https://github.com/jonathanKingston/merge-windows/issues/1) and offered a donation. Please join me and express your support there if you would also like to see it. — AdamS, Aug 12 '18 at 10:59
This can now be done natively in Firefox. See update to DrMoishe Pippik's answer. — fixer1234, Apr 02 '19 at 20:30

score 25 · Accepted Answer · edited Apr 02 '19 at 20:27

25

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.

edited Apr 02 '19 at 20:27

fixer1234

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answered Jul 20 '18 at 00:46

DrMoishe Pippik

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Yes, i have enough tabs open to make this inconvenient, so am hoping for a programmatic method to merge windows. – M Farkas-Dyck Jul 21 '18 at 06:26
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Hope you don't mind that I updated this for the new feature. It was already the right answer. :-) – fixer1234 Apr 02 '19 at 20:28
@fixer1234, Thanks for the edit. +1 – DrMoishe Pippik Apr 02 '19 at 23:48
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Thanks, the multiple selection works for me! – M Farkas-Dyck Feb 05 '20 at 22:07

score 1 · Answer 2 · answered Apr 02 '19 at 13:50

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For Firefox you have an extension:

Merge-window

and for Chrome I'd been using for years:

JoinTabs

answered Apr 02 '19 at 13:50

elMestre

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Alas, merge-window merges **all** windows, not merely 2 given windows. – M Farkas-Dyck Apr 02 '19 at 19:09
Yes, both of these extensions merge all tabs scattered trough all windows into a single window – elMestre Apr 04 '19 at 08:41

How to merge 2 windows in Firefox

2 Answers2