Feature summary (what you would like to be able to do and where):
Add obsolete vendor prefixes such as -moz-border-radius to Linter.

Benefits (why should this be implemented?):
Using obsolete vendor prefixes can sometimes make the page layout work incorrectly when they are the only ones used (see this edit which fixed the border radius). In other cases when they are used with modern values they are just cruft at best, and at worst require additional updates to make sure values are in sync. Prefixed -border-radius for example has been obsolete since 2011.