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How can I set a default window size when Firefox opens (on a Mac)?

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Firefox opens at random sizes, sometimes full screen, sometimes not

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Please click the Solved It button next to the answer that solved your Firefox support issue, it appears when you are logged in, so this thread gets marked as Solved to help other users who may have this same problem.

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If

  • Changes made to the browser window's size and position are not remembered when you restart Firefox.

Then see:

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Thank you very much.

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Chosen Solution

Please click the Solved It button next to the answer that solved your Firefox support issue, it appears when you are logged in, so this thread gets marked as Solved to help other users who may have this same problem.

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Done. Thanks.