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How can I increase the font size of the message list? I downloaded the new Firefox, but I am not allowed add-ons

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I want to increase the font size of the message list, as it is now very small and hard to read. I was told I had to download the newest version of Firefox, which I did. But I was still not allowed to add the add-on that will enable me to increase the font size of the message list. HELP!

I want to increase the font size of the message list, as it is now very small and hard to read. I was told I had to download the newest version of Firefox, which I did. But I was still not allowed to add the add-on that will enable me to increase the font size of the message list. HELP!

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Thunderbird has no dependence on Firefox. That was poor advice.

You need this add-on: https://addons.mozilla.org/en-us/thunderbird/addon/theme-font-size-changer/

How to install: https://support.mozilla.org/en-US/kb/installing-addon-thunderbird