There is also a big difference between "provided a degraded experience in non-Chrome browsers" and "you have to actively disable CSP (a global setting) for it t

There is also a big difference between "provided a degraded experience in non-Chrome browsers" and "you have to actively disable CSP (a global setting) for it to work in Firefox." Also, with respect to performance, this comment in the article might shed some light: "Also see Bugzilla entry. The use of spare arrays with huge indexes was a performance issue in Firefox. It's been fixed in Inbox and in FF but not shipped in FF yet. (https://bugzilla.mozilla.org/show_bug.cgi?id=1087963)" https://bugzilla.mozilla.org/show_bug.cgi?id=1087963)"