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I don't know how to open/install the font size increaser once it's been downloaded.

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I downloaded the add on to make fonts bigger, but I don't know how to open or install it.

I downloaded the add on to make fonts bigger, but I don't know how to open or install it.

Chosen solution

Was it this one: https://addons.mozilla.org/thunderbird/addon/theme-font-size-changer/

Could you check the Tools menu and see whether it has added an entry there? (I saw that in the second-to-last screenshot on that page.)

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Chosen Solution

Was it this one: https://addons.mozilla.org/thunderbird/addon/theme-font-size-changer/

Could you check the Tools menu and see whether it has added an entry there? (I saw that in the second-to-last screenshot on that page.)

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Oh... if it isn't installed yet, please see this article: Installing an Add-on in Thunderbird