Looks the same to me on both Browser. So what does your screenshot look like for each?

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Thank you!

The Inspector shows that there are a lot of font tags nested on that page.

• https://developer.mozilla.org/en-US/Tools/Page_Inspector

Firefox gives up after a specific number of nesting levels (I think 200) and no longer renders the page properly. Font tags need to be closed properly (</font>), but these tags are missing and for every item a new font tag is opened. You can see in the second screenshot that Firefox generates all these closing tags at the end of the DIV container.