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windows doesn't open maximised

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When I open firefox the window always open only 3/4

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Are you saying you can't change to the full window, or that you can't grab the corners and pull them out?

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When I launch firefox it opens as a 3/4 screen as default.

I want it to open as a maximised screen as default (but not a full screen)

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Are you talking about that box on the right? I don't know what it is, but there is a closing X at its upper right.

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Try to rename/remove xulstore.json and if present delete localstore.rdf in the Firefox profile folder with Firefox closed.

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

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Hi cor-el,

I deleted xulstore.json and there was no localstore.rdf file.

It still opens 3/4 full. This is so annoying.

How do you make a window open maximised by default anyway? Is it just deleting the json file. Don't you need to also do anything else?