Oops! Found a problem.
In the past, when I "unlocked" the tab (and red "locked" icon disappeared), links would then open in the same tab. That no longer happens. Links are always opening in another tab, even if I unlock the tab. This happens on several web pages I have looked at that always worked right before.
look here http://tmp.garyr.net/forum/viewtopic.php?p=44583#44583
Starting with version 100918a i was added new pref there are 2 separate preference to
one to control only how link open - extensions.tabmix.opentabforLinks
0 - default, 1 - all link in new tab , 2 - links to other site in new tab
the 2nd control is general lock tabs control - extensions.tabmix.lockallTabs
true - new tabs are lock.
if you unlock a tab but stile using the 1st pref set to open all links in tabs then all links will open in tabs.
just change extensions.tabmix.opentabforLinks to 0, or use Tabmix Options > links to set Force to open tab... to Nuthing