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Border around Firefox

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Few days after installing a strange border started appearing around the app unless I'm in full screen which I don't like to use. What's happening and how can I stop this?

Few days after installing a strange border started appearing around the app unless I'm in full screen which I don't like to use. What's happening and how can I stop this?
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Hello You can see if you want to install the update, and if that doesn't work, try reinstalling it. Thanks!