Like "LetItSnow" (https://addons.mozilla.org/en-US/firefox/addon/letitsnow/?src=search), this is a mildly interesting and fun idea to add some "pizazz" to tabs while browsing.
However, it has a few minor annoyances that prevent serious browsing: * The design (though beautiful) obscures page content quite a bit, and prevents page interaction such as clicking elements * Toggle is per-tab: any tabs enabled must be refreshed after disabling (double-click or middle-click & hit refresh to toggle) * No music will play for me when certain privacy add-ons are also present--specifically, RequestPolicy (default settings), Ghostery (default settings), or NoScript (when set to block scripts globally)
Criticism aside, I didn't expect this to be perfect--just jovial and eye-catching, which it is. I like it regardless and appreciate the developer's efforts. Kudos. :-)