You must probably be using 16-bit computer because on my x86_64 system Firefox's about:processes tab shows 45-65 Mb of RAM usage after opening this page and scrolling. And Firefox's builtin tools tend to show smaller number than real usage: htop shows use of 85 Mb of PSS (proportional set size, that properly accounts for pages shared between processes).
Or you must be measuring something more than just the memory Linen uses, like measuring how much memory the tab itself takes, which is Firefox + the application.
Doing a heap snapshot will give you a better view of the page memory usage in isolation, without involving the browser itself.
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