There have been earlier posts about Tab Mix Plus, so it seems to be a 'known issue'. You can go to the Search box in the upper right corner of this webpage and enter: Tab Mix ...and then read through the results. Don't know if it will help your exact problem, but X-Notifier admin suggested a fix for the earlier issue... http://xnotifier.tobwithu.com/wp/forums/topic/issue-with-firefox-addon-… ...also, some users used an older version of programs which worked together.
Known issue
There have been earlier posts about Tab Mix Plus, so it seems to be a 'known issue'.
You can go to the Search box in the upper right corner of this webpage and enter: Tab Mix ...and then read through the results.
Don't know if it will help your exact problem, but X-Notifier admin suggested a fix for the earlier issue...
http://xnotifier.tobwithu.com/wp/forums/topic/issue-with-firefox-addon-…
...also, some users used an older version of programs which worked together.