Pinned tabs not working correctly

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These are from tab mix plus, I think. If you pin a tab it remains on the tab 
bar at all times, and it's also available in all the tab groups (with the 
defaultish firestorm panorama tab manager)

What steps will reproduce the problem?
1. Pin a tab
2. Go to another group. You will see the pinned tab
3. But if you click on the pinned tab, it behaves like you clicked on the first 
tab.

What is the expected output? What do you see instead?
I expect to see the contents of the pinned tab. Instead, I see the contents of 
the first tab (and if I have multiple rows of tabs, then the tab bar scrolls to 
the first tab as well).

System Info:
What version of TabGroups Manager are you using? 2014.12.21.005
What Operative System are you using? 32 or 64 bits? Windows 7x64
What version of Firefox are you using? um *blush* palemoon
Are you using any other tab extension like Colorfull tabs, Multiple Tab
Handler, TabMix Plus..?
Tab mix plus and multiple tab handler

Please provide any additional information below and screens capture if
possible.

Sometimes if I unpin all the tabs and then repin them, they'll disappear from 
the other windows, but reappear when I restart the browser

Original issue reported on code.google.com by [email protected] on 13 Jun 2015 at 5:44