I don't have a regression range handy,but sometime in the last few weeks nightly has begun to open new tabs from either the right-click menu or via an <a href="..." target="_blank"> at the end of the tab bar vs how it used to right next to the parent tab. I have not knowingly change configuration on any of the machines I have seen this on. Is this a regression? see also: https://bugzilla.mozilla.org/show_bug.cgi?id=465673#c162
Can you reproduce this in safe mode?
Good call. It turns out Tab Mix Plus got auto-reenabled at some point which was causing this behaviour which was installed on multiple machines. Closing.
Status: NEW → RESOLVED
Closed: 8 years ago
Resolution: --- → INVALID
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