no-misspelled-properties is incorrectly failing on '-moz-osx-font-smoothing'

[nmcclay]

I got around this issue by providing this exception to my config, but this would seem to be an error to me since font-awesome and many other icon fonts define this property for firefox.

  no-misspelled-properties:
    - 2
    - 'extra-properties':
          - 'osx-font-smoothing'

[DanPurdy]

Looks like it will be down to the strip prefix helper function, it's only looking to strip singular prefixes such as -o- or -moz- not -moz-osx- see here

We can look to improve this. Are there any other 'dual' prefixes to be aware of that you know? I couldn't find much information on them before.