The firefox button used to be on the left, with tabs lined up beside it reaching the top of the screen. Now the firefox button is on its own, with tabs on the row below it. This wastes a lot of space at the top of my screen, can I put it back how it was?

Question

Previously, the firefox button was at the top left and tabs lined up beside it, so that the top of the tabs reached right to the top of the screen. Close/minimise etc. were at top right.
Two days ago, it switched so that the firefox button is at top left, close/minimise etc. are still at top left, but now the tabs are on a row below, leaving a gap at the top where I can see through to the desktop. There is also a larger border than before round the whole firefox browser window, more wasted space.
I have the windows 7 quick links bar at the top of my desktop, now that firefox has left a gap above the tabs it means it is easier to accidentally hover over the bar when changing tabs, this is annoying as it brings it to the front and disrupts the ability to change tabs quickly.

Answer 1

-> Tap '''ALT''' key or press '''F10''' to show the Menu Bar
-> go to View Menu -> Toolbars -> select/unselect '''Taps on Top'''
Check and tell if its working.