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Taskbar Icon opens new instance instead of stacking (V10.0 on Win7)

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The original behaviour of taskbar icon was to stack instances of Firefox. Now (on 1 out of 3 computers) Firefox places a new icon on taskbar and stacks subsequent windows on the new one only.

The original behaviour of taskbar icon was to stack instances of Firefox. Now (on 1 out of 3 computers) Firefox places a new icon on taskbar and stacks subsequent windows on the new one only.

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Perform the suggestions mentioned in the Replies provided in the following thread:

Check and tell if its working.