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Why doe's my screen suddenly go from 125% to gigantic on certain apps

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Ok, i suddenly went from a 125% screen which fulfilled my needs to a gigantic screen that i had to go into my os to change, it happened suddenly and is almost impossible to get back there without going back to 100% and then going full screen. anyone got any answers?

Ok, i suddenly went from a 125% screen which fulfilled my needs to a gigantic screen that i had to go into my os to change, it happened suddenly and is almost impossible to get back there without going back to 100% and then going full screen. anyone got any answers?

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Is this on a web page, or your monitor? Any website, some, a few?

Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options)
key, and then starting Firefox. A small dialog should appear. Click Start In Safe Mode (not Refresh).

Is the problem still there?

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You may have accidentally zoomed web page(s). Reset the page zoom on pages that cause problems.

  • View -> Zoom -> Reset (Ctrl+0/Command+0 (zero))

You can remove all data stored in Firefox from a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox from that domain like bookmarks and history and cookies and passwords and cache and exceptions, so be cautious. If you have a password or other data from that domain that you do not want to lose then make sure to backup this data or make a note.

Can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website then data from that website will be saved once again.