Some characters show as grey box (missing from font?)

Browsing, e.g. <http://www.haskell.org/onlinereport/haskell2010/haskellch4.html#x10-820061>, some of the characters are replaced by a grey placeholder box. Comparing with the desktop, one seems to be U+22C6, so I'm thinking that it can't find a font to display that with. But it seems to affect some ordinary ASCII-range characters too, in Fig 4.1 and following text at the URL above, so maybe there's more going on?
More generally, from other questions here I gather that Firefox is using its own fonts rather than relying on what's on the device already. So, can I shore that up with some good fallback fonts like symbola?

Firefox will use Charis or Clear Sans by default. Though if the glyph is not found in those fonts it will check the other system fonts such as Roboto or Droid Sans.
The glyph coverage should be the same as Chrome or the 'browser/internet' application. If it is not then we would need a copy of the fonts installed on the phone as we have run into phones that ship corrupt fonts. Doing this requires the Android SDK and executing the following command
adb pull /system/fonts/
Then zip the fonts and share them with us.

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