Because Firefox used to crash in the WebWorker code that Google uses on Chromium. See https://bugzilla.mozilla.org/show_bug.cgi?id=1096492#c21 https://bugzilla.

Because Firefox used to crash in the WebWorker code that Google uses on Chromium. See https://bugzilla.mozilla.org/show_bug.cgi?id=1096492#c21 https://bugzilla.mozilla.org/show_bug.cgi?id=1096492#c21 According to that bug report, it should be fixed in Firefox 38; there’s some confusion about whether it’s fixed in 36 or not.