Chris Austin via tde-users wrote:
Hello,
I was in the middle of making a donation to a non-profit, in Firefox running in Trinity, when suddenly, for no apparent reason, Firefox became full screen,
...
I guess the fact that the top part of the Firefox window vanished as well, so the entire screen was taken up by the main display area of Firefox, might indicate that this is a Firefox issue, rather than a Trinity issue, so this might be the wrong forum. Sorry if that's the case. I have been using Trinity continuously since about March 2017, and I think it's really great. Nothing like this has ever happened before.
F11 - has nothing to do with Trinity
BR