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How to make fixed size window in privacy.resistfingerprinting (Firefox)

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In Firefox, I use `privacy.resistfingerprinting = true`. How can I set the window size (1024x768 or 1366x768 or another) that I need? So that I open the browser and the window size matches the resolution I need.

What I did:

Set the values to `privacy.window.maxInnerHeight` and `privacy.window.maxInnerWidth`. But the size is 1000x700, 1400x800, etc., i.e. not the one i need.

Used `privacy.resistfingerprinting.letterboxing` with the specified resolution in `.dimensions`, it seems to work. BUT, this works with a delay. I open a test page in which resolution is displayed through `<body onload="alert (window.innerWidth)">` and at the very beginning the real value is displayed and only then changed using letterboxing. That is, it is possible to intercept the real value.

I tried to resize the window through `Window.resizeTo ()`, but it does not change.

Tell me how to launch a browser with a window of the desired size with privacy.resistfingerprinting enabled?

In Firefox, I use `privacy.resistfingerprinting = true`. How can I set the window size (1024x768 or 1366x768 or another) that I need? So that I open the browser and the window size matches the resolution I need. What I did: Set the values to `privacy.window.maxInnerHeight` and `privacy.window.maxInnerWidth`. But the size is 1000x700, 1400x800, etc., i.e. not the one i need. Used `privacy.resistfingerprinting.letterboxing` with the specified resolution in `.dimensions`, it seems to work. BUT, this works with a delay. I open a test page in which resolution is displayed through `<body onload="alert (window.innerWidth)">` and at the very beginning the real value is displayed and only then changed using letterboxing. That is, it is possible to intercept the real value. I tried to resize the window through `Window.resizeTo ()`, but it does not change. Tell me how to launch a browser with a window of the desired size with privacy.resistfingerprinting enabled?