Addition: The problem does only occur when starting firefox by clicking on a link (any link, http or https makes no difference) in thunderbird.
If I start firefox from the panel or eg. by right-clicking on a link in gnome-terminal everything works fine.
Addition: The problem does only occur when starting firefox by clicking on a link (any link, http or https makes no difference) in thunderbird.
If I start firefox from the panel or eg. by right-clicking on a link in gnome-terminal everything works fine.