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My Yahoo email page suddenly became so small I cannot read it, and I cannot get it to go back to normal size. Why is this even possible and how do I fix it?

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I higlighted a portion of an email I was forwarding so I could delete that part, and somehow during that process, the entire page reduced in size to the point that it's too small to read. I have no idea how I did it and I can't get it to return to normal size. Logging out and back in doesn't help, nor does shutting the computer down and restarting. My wife's email is normal size, and MY email is normal size when I use Internet Explorer, but not with Firefox.

I higlighted a portion of an email I was forwarding so I could delete that part, and somehow during that process, the entire page reduced in size to the point that it's too small to read. I have no idea how I did it and I can't get it to return to normal size. Logging out and back in doesn't help, nor does shutting the computer down and restarting. My wife's email is normal size, and MY email is normal size when I use Internet Explorer, but not with Firefox.

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Reset the page zoom on pages that cause problems: View > Zoom > Reset (Ctrl+0 (zero); Cmd+0 on Mac)

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I found out that holding down the CTRL key and rolling the mouse wheel will zoom the screen in and out. There might be other things that fix it, but I know this works.

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You can set all the mousewheel.withcontrolkey.action pref to 0 to perform a scroll and avoid zooming the page.

To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website.
If you see a warning then you can confirm that you want to access that page.

See: