Posted 24 February 2012 - 10:05 PM
I saw something about this problem back when Windows 7 was first released. I tried to search for it to see if there was a solution now but I could not find it.
Even though I don't have an answer. I do have somewhat of an explanation and maybe a workaround.
Though you have chosen to "Never Combine" you may have noticed that if you try to drag one of the multiple Firefox tabs to a different place on the taskbar, it drags all of the Firefox tabs as a group. So while they are not "Combined" they are still "Grouped". The problem that you seem to be having is that Windows gives you no way to customize the order in which they are "Grouped". It keeps grouping based on some default rule (which you can't change) that causes them to move when some property (time last modified, all old tabs closed, new form submitted, I don't know) changes in an individual Firefox window.
The reason I looked into this for you tonight was that I figured by now there would be at least a third party program to help do this but surprisingly, I found none.
There may be a registry key or it is hardcoded into a Windows system file for some reason that we don't know.
If you need to see the programs quickly to react effectively to changing situations, you might be able to find a custom sidebar gadget that does it or you could open the Task Manager, check OPTIONS>ALWAYS ON TOP, uncheck OPTIONS>MINIMIZE ON USE and click on the APPLICATIONS tab and size it so you can see all your Firefox page titles and place it on a part of your screen where it does not block your work too badly. Then double-click on whichever Firefox window you want to open when you need it and you should be able to fire through them quickly. You can't change the order but you can read the page title easily.
Hope this helps