If I had the TranslateThis icon on my Addon Bar, my Firebug icons (also on the Addon Bar) disappears after restart or on new Firefox windows. If I placed the TranslateThis icon elsewhere (eg. in my Navigation Toolbar), this doesn't happen. I had even tested my Firefox with only TanslateThis & Firebug installed, and had the same results.
If I had the TranslateThis icon on my Addon Bar, my Firebug icons (also on the Addon Bar) disappears after restart or on new Firefox windows. If I placed the TranslateThis icon elsewhere (eg. in my Navigation Toolbar), this doesn't happen. I had even tested my Firefox with only TanslateThis & Firebug installed, and had the same results.