macOS Sonoma Doesn’t Remember Window Size

I had this issue following my upgrade to Sonoma. I've just fixed it by making the extended display my "main display". All windows are now remembered as they were previously.

I also selected "displays are separate spaces" so that actually there isn't really a "main display". i.e. Both windows have the top menu and a minimised application dock.

I'm pretty sure I had these settings on before, so perhaps the upgrade reverted a couple of them.

If you UNcheck "Close windows when quitting applications" in System Settings->Desktop & Dock, then the issue is handled automatically by the OS, not Firefox.

I don't think this is true either. I have been using Mac OS since Leopard, and I have never experienced this issue before. Every window size I have set has been honoured. Except for Sonoma.

Currently, I am running Sonoma 14.1 on a Mac Mini M2 Pro, and I have issues with the window size being remembered with the Apple Music app, and the Spark email client. Even if I minimize these windows, when I open them again, the window size is not honoured.

I don't have issues with Firefox, but I certainly don't think this issue is specific to Firefox either.

If you do NOT check "close windows when quitting applications", and you quit and start an application, all the windows should be restored in exactly the same size as they were. But once you actually close windows (either directly or by quitting if "close windows..." is checked), then there you are, as dialabrain explained.

DoubleW wrote:

This is not the behavior I remember on Ventura though. Is this the new for Sonoma?

It will be the default size after closing the window and reopening.

Anyway, I am using an Intel MacBook, which has a different Sonoma than yours, which is Sonoma for ARM. Upgraded to 14.1 everything works well - tested all the apps I usually use.

Starting two days ago, when I close the latest version of Firefox in the evening (where I have 20-30 windows stacked up neatly on top of each other), when I go to reopen Firefox the next morning and select "restore previous session", all the windows tile all the way across my main screen. The windows no longer all neatly stacked on top of each other. This is HIGHLY annoying and I can find nothing on the net that describes this issue, much less offering a solution.

FWIW: Firefox has never offered the traditional "Quit and Keep Windows" option when quitting as many (most?) other applications do.

Mac Studio M1 Max running most current version of Ventura.

Nope, I unchecked the "Close windows when quitting applications" setting and upon quitting and restarting Firefox, all 35 windows tiled across my main screen despite all windows being neatly stacked on top of each other prior to quitting.

Is there an Mozilla/Firefox forum where I can describe this issue?

dt.k wrote:

I don't think this is true either. I have been using Mac OS since Leopard, and I have never experienced this issue before. Every window size I have set has been honoured. Except for Sonoma.

What is the Sonoma your Mac is running? My MBP is running this,

and, no problems whatsoever!

FWIW. if you close the windows they will be the default size the next time you open the app.

DoubleW wrote:

This is not the behavior I remember on Ventura though. Is this the new for Sonoma?

No, it's not new. It's been the behavior of windows in macOS for as long as I can remember.

That would be a function of Firefox. Try "Get Help" from Firefox > Help.

Thanks for the tip, but there is no help there for this problem.

You actually have to pose a question to the community.