Doesn't appear correctly using palemoon web browser

[hmm5]

Exact URL of where the bug happened

Board doesn't appear correctly.

Maybe it has something to do with this issue again?
#12856

Steps to reproduce the bug

Click on the daily puzzle, etc. and the board doesn't show up correctly.

What did you expect to happen?

The board to show up.

What happened instead?

The board doesn't show up.

Operating system

Manjaro Linux

Browser and version (or alternate access method)

Palemoon

Additional information

No response

[ornicar]

What's the browser version?

[hmm5]

Palemoon version 33.3.0. The issue started happening recently, and was working fine earlier.

[ornicar]

git bisect eventually led me to #15976

[ornicar]

remove min/max css fallbacks as IE support is probably no longer a goal

Using these new CSS features resulted in bumping our browser support: f55c099

If palemoon is based on a Firefox webview older than 75, then this bug would be explained.