Some websites are showing up magnified, how do I get them back to the right size?

Particularly is showing up with huge font and I can see no way to shrink it back to it's original size so that I can view the whole page. I have tried reopening the page, but this particular website keeps opening as if it has been magnified. Even after reopening firefox, the page is still magnified. Is there a tool I can use to change the screen resolution on just this page? The rest of my sites open just fine.

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