Unfortunately, It's Mostly SPAM and Potential Malware Rated 1 out of 5 stars
The notion that these things need to be covered in SPAM designed to trick the user into clicking nefarious buttons is nonsense.
There is an immense community of open source developers who feel no need to resort to such chicanery, and I'm sick of hearing about how malware and SPAM are needed to "support the plugin".
The plugin does convert some videos to MP3, but only after navigating a minefield of atrocious advertisements, some enticing you to "Download Now", before presenting you with downloads of dubious safety.
Be careful with this.