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change font size Firefox ios iphone

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I need to increase the Font Size & make it BOLD in iphone Firefox. how to do this ?

I need to increase the Font Size & make it BOLD in iphone Firefox. how to do this ?

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have you tried to use the shift key?

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While there is no way I know of to do it in Firefox for iOS, you can increase the font size for all apps in your iphone settings. For more information, visit https://support.apple.com/HT202828

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Is Shift key an iphone app? I can't find it. ( other than the keyboard shift key. . Chris.. thanks for the suggestion.. HOWEVER, I already tried that. I already have those (mainly works with iphone Menu) fonts increased.. but not FireFox. argggg