FireFox order of windows changes after reboot



My system:

Acer VERITON MN: VM4630G-i7477X
32GB Ram
256GB SSD program drive
1-TB HDD data drive
Win7Pro 64-bit with Taskbar configuration manager “7+TaskbarTweaker”
FireFox v 56.0.2 (64-bit) with FireFox extension “TabMixPlus”


I normally keep five (5) FireFox windows open with a total of 43 tabs between them.

Each window can have from 4 to 20 tabs.

Whenever I shutdown, reboot & restart FireFox the order of the windows shown
in the Taskbar is never the same.

Prior to shutting down I have ordered the FF windows the way I want them, but
upon rebooting and restarting FF the windows are never in the same order.

What to do?

Is there a setting I’ve missed?

Thanks for any advice!


Can you explain how you set up the tab order in Firefox?


I’m not talking about tab order.

The problem is with the order of FireFox windows along the Taskbar.

Within each window, the order of tabs is intact.

But if I order five windows in 1-2-3-4-5 order, when I shutdown, reboot and
restart FireFox the windows may come back as 3-1-2-4-5 or 2-4-3-5-1 or
3-2-1-5-4 or any other combination.

I want to know how to keep my FireFox windows arranged as 1-2-3-4-5
along the Taskbar every time I shutdown, reboot and restart FireFox.



This is not a definitive answer, but I’m almost certain the order the windows are in after a restart will be determined by how many tabs there are (and how big the pages in them) open in each window - in other words the lightest ones will finish loading first. This would be easy to test by ordering them in increasing size and seeing if they retain that order after a restart.


@ Gordon Hay

Good idea, however, I tried your suggestion and . . .
same result: windows still rearranging upon
closing and re-opneing FireFox :frowning:

Is there a way to lock in the order of FF windows
using a utility or something else?



Could you open each Firefox as a separate instance of the program and pin it to taskbar?