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Firefox initially opens filling my 27" monitor. How can I get it to open smaller?

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Starting up Firefox on a web page it completely fills my 27" monitor. After dragging the window to about a third of that, subsequent windows stay at that size. After turning off Firefox and reopening it, it reverts back to that monitor-filling size. How can I get it to stay at the smaller size?

Starting up Firefox on a web page it completely fills my 27" monitor. After dragging the window to about a third of that, subsequent windows stay at that size. After turning off Firefox and reopening it, it reverts back to that monitor-filling size. How can I get it to stay at the smaller size?

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You can also try to remove the Firefox plist file (org.mozilla.firefox.plist).

Go to "~/Library/Preferences" and remove the plist file for Firefox (org.mozilla.firefox.plist)