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firefox 4 middle mouse button click acts different from v3

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clicking on the middle mouse button (not scrolling) acts like "open link in duplicated tab" rather than how it used to act like "open link in new tab". It places the new tab at the bottom/end of the list of tabs rather than how it used to as a child of the tab in which the middle button was clicked. Is there an option to change this behavior?

clicking on the middle mouse button (not scrolling) acts like "open link in duplicated tab" rather than how it used to act like "open link in new tab". It places the new tab at the bottom/end of the list of tabs rather than how it used to as a child of the tab in which the middle button was clicked. Is there an option to change this behavior?

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jscher2000: THANK YOU. The thread was doubly useful.

1. I had the same problem to cor-el's post to "Set the pref browser.tabs.insertRelatedAfterCurrent to true on the about:config page" as orwel had: it will not be changed.

2. I disabled my addons one by one and found that THE PROBLEM WAS with Duplicate This Tab 1.2 When it is disabled, the center mouse click works as it used to -- and I assume this means 'correctly'. Certainly it's the way I want it to work:-)

3. I am new to this support path. If you think the information I just posted can help those on the thread you pointed to, and you are so inclined, please inform them about Duplicate This Tab 1.2 should anyone there be using it.