It has ads, it's not offline and It sends the videos you watch to videodroid.org, and apparently they charge for 1080 but the claim they're the only add-on to support 1080p is blatantly false!

They use some obfuscated code which is allowed by Mozilla but it is against the provisions of the MPL license:
" “Source Code Form” means the form of the work preferred for making modifications." If your preferred style of coding is writing unmanageable and unreadable code then fine but If you don't want "Script kiddies" copying your code and modifying your advertisements then also change the license to something more restrictive!

Using obfuscated code is sketchy as hell anyways and usually a tactic by malware authors but I'm sure that's not a problem for you! While Mozilla reviews the "human readable code", let's not forget that Stylish a highly popular add-on was stealing users browsing history for months before Mozilla finally did anything!