I was able to get the exact same issue. I will try with upstream 3.0
firefox but i think its the site that your using. You are right though
firefox should beable to change back to normal size (full screen)
** Changed in: firefox (Ubuntu)
Importance: Undecided => Low
Assignee: (unassigned) => Mozilla Bugs
Status: Unconfirmed => Needs Info
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Window stay shrinked when using back button from shrinked page
https://launchpad.net/bugs/93367
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