[Jaymoss]

If you are on a PC or laptop create a shortcut to the browser. Right click shortcut select properties in the target field add the following to the end (do not miss the space)

--start-fullscreen

and save

for example "C:\Users\Username\Desktop\Chrome.exe" --start-fullscreen

open using shortcut

or you could just press F11

This is for proper full screen though not maximised

When you next close your browser from maximised press the shift key when you do that forces it to be remembered