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How to increase font size for email, which with Firefox is too tiny to read?

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When I try to access my (web-based) email account through Firefox the page comes up in minute type which is illegible. I can find no way of enlarging the type and have to switch to a different browser. A second email account with another web-site comes up very small but is just about readable.

When I try to access my (web-based) email account through Firefox the page comes up in minute type which is illegible. I can find no way of enlarging the type and have to switch to a different browser. A second email account with another web-site comes up very small but is just about readable.

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On your keyboard, hold down on "Ctrl" and use the "+" or "-" key to adjust the text size to your preference.