Update: not a dupe of bug 1409638 -- that one is actually fixed in Nightly via bug 1375476. However, this bug here isn't fixed. Here's a testcase to compare dropdowns with monospace vs. serif as the font-family. Neither actually gets used in the dropdown menu (though they do get used in the dropdown *button* -- i.e. it's honored on the `select`, but the `option` seems to just fall back to a system font).
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Update: not a dupe of bug 1409638 -- that one is actually fixed in Nightly via bug 1375476. However, this bug here isn't fixed (on linux). Here's a testcase to compare dropdowns with monospace vs. serif as the font-family. Neither actually gets used in the dropdown menu, on Linux (though they do get used in the dropdown *button* -- i.e. it's honored on the `select`, but the `option` seems to just fall back to a system font).