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My Yahoo email pages opens in size too small to read. How do I fix?

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I was using the wheel on my mouse to scroll down the page, and it abruptly stopped scrolling and reduced the size of everything on the screen. I was unable to reverse it. It is only with my email using Firefox, and does not occur with Internet Explorer.

I was using the wheel on my mouse to scroll down the page, and it abruptly stopped scrolling and reduced the size of everything on the screen. I was unable to reverse it. It is only with my email using Firefox, and does not occur with Internet Explorer.

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