'Bug' when starting Firefox

Not sure which of the plugins this might be related to or if its even a bug so for now just tagging this in “Test Pilot”. whenever I start Firefox it opens up a grey page with the search bar at the bottom and a “new tab” function on the right side. but searching anything or using a bookmark will display the url and show as loaded but the page will stay grey as if nothing has happened. work-around for me is to just right click my Firefox Icon and having it open a new window, then it opens with the normal left-sided tab bar and works as usual. but if I should close it and just start up Firefox again normally it starts up the grey window again. am I missing something? or is it indeed a bug