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Smartzone on Comcast.net is miniscule. How do I enlarge it?

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When I enter the Comcast email service the list of emails is extremely small that it cannot be read. I need to enlarge the fonts so that they are readable. I do not have this problem on Internet Explorer. Internet Explorer has an icon to enable font size changes. How do I change font sizes on Firefox?

When I enter the Comcast email service the list of emails is extremely small that it cannot be read. I need to enlarge the fonts so that they are readable. I do not have this problem on Internet Explorer. Internet Explorer has an icon to enable font size changes. How do I change font sizes on Firefox?

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View > Zoom - Reset - while you are viewing the Comcast SmartZone

See this: https://support.mozilla.com/en-US/kb/Page+Zoom

If you are holding the Ctrl key and then use the mouse scroll wheel, the page zoom level will change.