Font size T-bird and Firefox

This might be old hat to the computer whiz kids here. There is a add on for Firefox and Thunderbird that regulates font size. Theme Font & Size Changer The subject lines for Usenet posts were uncomfortable to read. The size changer fixed that. I couldn't find anything in Thunderbird preferences to fix that.
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On 6/12/2016 7:20 AM, Dean Hoffman wrote:

Useful ad on which I have.
Think it has been discussed in news.mozilla.org.
I often go there for help after exhausting my personal search.
I download Thunderbird, Firefox and general groups. Helpful folks there.
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<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
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Upload

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