Currently PMP packages only cover Mozilla Firefox installs that are installed to C:\Program Files\ location and they do not work for installs where a user has installed Mozilla to their local profile instead. Please add this option to patch user profile based Mozilla FireFox installs so that all security updates can be applied in a timely manner.
Hi! On the update-side, if you're looking for an SCCM's software update, as per information from the FAQ, it's not possible to generate WSUS-backed updates for per-user installs. See Are User Based Applications supported?.
Else, I'll let the devs at PatchMyPC evaluate your idea.