Feature request: Would like to select multiple tabs, e.g. for sending to other group

Before submitting the issue, please check that your version of TabGroups
Manager is the lastest stable one. (Check it in Firefox Extensions).

What steps will reproduce the problem?
1. Click in one tab. It is selected.
2. Shift click in another tab to add a second tab. 
3. The second tab is selected, but the first tab is unselected

What is the expected output? 

I would hope to be able to select multiple tabs. This would be very useful when 
I want to send multiple tabs to another group.

What do you see instead?

Only the last tab I selected is selected

System Info:
What version of TabGroups Manager are you using? 2013.04.10.001
What Operative System are you using? 32 or 64 bits? Linux Ubuntu 13.10, 64 bits
What version of Firefox are you using? 27.0
Are you using any other tab extension like Colorfull tabs, Multiple Tab
Handler, TabMix Plus..? no

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

I'm happy to help. I'm a moderate C and C++ programmer, no Java or add-on 
experience. Excellent at QA.

Original issue reported on code.google.com by michaels...@gmail.com on 21 Feb 2014 at 3:45

Chrisi75 / tabgroupsmanager

Feature request: Would like to select multiple tabs, e.g. for sending to other group #39