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Firefox resizing automatically in macOS

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Why does Firefox resize 'automatically' as I close tabs? I usually have FF set to around 3/4 of my screen width, but when I close certain tabs it 'automatically' (without my permission) resizes to 100% width. It's SOOOOO annoying and I can't seem to figure out why it's doing it!

BTW it doesn't do the same thing on Ubuntu or Win10 as far as I can see.

Why does Firefox resize 'automatically' as I close tabs? I usually have FF set to around 3/4 of my screen width, but when I close certain tabs it 'automatically' (without my permission) resizes to 100% width. It's SOOOOO annoying and I can't seem to figure out why it's doing it! BTW it doesn't do the same thing on Ubuntu or Win10 as far as I can see.

All Replies (2)

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It isn't when you close any tab, but specific ones?

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Its not every tab, that much is for certain. But I can't figure out what triggers the behaviour in certain tabs. IIRC it happened the other day when I closed a Wikipedia tab, and went to another Wikipedia tab!