Edited to say: CROSS-POSTED! Congratulations. I know what you mean by "old eyes"! My old monitor at work died, and they "had to" give me one that was much wider. It helps.
P.S.
I don't know if this helps at all within websites, but for Windows text, I always use "large fonts", and sometimes customize them further to have bigger-than standard font size (like 11, 12 or 14 point type).
Right-click Desktop | Properties | Appearance | Font Size | Extra Large
and also Advanced | (then Message Box, Active Title Bar, Inactive title bar and Item | Icon) and increase the font size.
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The old cross-post is now moot, unless someone wants details about deleting Cookies in FireFox ....
Could the
number of categories be having an unexpected effect? If there are 6 categories just for "V" and "Z", Maybe Marilyn has more categories than have ever been tested.
Could you try Zooming OUT just to see what effect that has? As Seedfork says, try "CTRL -" a few times.
I assume you've also tried traditional things like refresh (F5)
and deleting cookies
Tools | Options | Pull-down History to show "Firefox will ... use custom settings for History" | Show Cookies
Then Highlight allthingsplants.com and click "Remove Cookies" ...
...
but first make sure you remember your ATP password!