Comment 18 for bug 281348

The Session restore mechanism in Tab Mix Plus is not causing the problem; it is disabled in my setup (I use Session Manager), but I still see the symptoms described above if both TMP and Ubufox are enabled.

I'm not sure what screenshots are going to achieve. A screenshot of an affected window will be a standard set of buttons and layout. Do you have Ubuntu Firefox Modifications (aka Ubufox) enabled? It appears to be the combination of both addons that causes the problem.