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how can i configure firefox, in a way that is fits in my monitor screen?

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When I'am using firefox, I only see a part of the screen. Every new screen I have to zoom to an size that the screen fits. This happend after a new installation. Is the a way in which I can make the screen fit automaticly?

When I'am using firefox, I only see a part of the screen. Every new screen I have to zoom to an size that the screen fits. This happend after a new installation. Is the a way in which I can make the screen fit automaticly?

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Were you using either of these add-ons that let you set a default zoom level for all sites? If so, check to see whether it was disabled during the upgrade. Or if this is a completely new installation, you might want to grab the add-on again.