Home computer (running Vista) no longer opens new tab by clicking on the tab line. Unable to open a new tab on same window unless the website does it. Computer (using XP) does not have this problem.

This problem has appeared only in the last week or two.

Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]

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