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In mac, when i open firefox the window is about 3/4 sized, i use the arrows to expand to fill my screen, i don't want "full screen" mode but I just want it to fill the screen in general when i open it.

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I have a mac mini, and i use firefox, when i open the app the window fills about 3/4 of the screen i use the arrows to expand the side and bottom to fill the screen (not full screen mode) just wanting firefox to open and fill the screen in general.

Once i expand the sides and bottom to fill screen i close and reopen fireox but it wont retain that size, so i see my desktop on the right and bottom areas. I thought by resizing closing it would retain that upon re opening, but it doesn't.

I dont want to be in full screen mode i just want when i open firefox for it to fill the screen and keep my top bar and whatnot in tact, is there something in settings or with key strokes via mac that I can do once i manually adjust the screen size so that it retains that size?

My current display settings are 1920x1080 if that matters and mac os tahoe with firefox 148 installed.

I have a mac mini, and i use firefox, when i open the app the window fills about 3/4 of the screen i use the arrows to expand the side and bottom to fill the screen (not full screen mode) just wanting firefox to open and fill the screen in general. Once i expand the sides and bottom to fill screen i close and reopen fireox but it wont retain that size, so i see my desktop on the right and bottom areas. I thought by resizing closing it would retain that upon re opening, but it doesn't. I dont want to be in full screen mode i just want when i open firefox for it to fill the screen and keep my top bar and whatnot in tact, is there something in settings or with key strokes via mac that I can do once i manually adjust the screen size so that it retains that size? My current display settings are 1920x1080 if that matters and mac os tahoe with firefox 148 installed.
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