Reason for disabling the 600% Volume Extension

I am wondering what was the exact reason for disabling the 600% volume extension.

Should the users be worried about credential theft or was the extension injecting affiliate links?

This add-on violates Mozilla’s add-on policies by harmfully altering web content to commit affiliate manipulation.

According to 600% Sound Volume is blocked for violating Mozilla policies – Add-ons for Firefox (en-US).

Thank you, that is reassuring.