We detected that McAfee ScriptScan for Firefox version 14.4.1 (it's an add-on for Firefox too) will make Firefox crash whenever you open our integrated video player.

 Just disable the McAfee add-on and you won't see any more player crashes.

 You can find more details on Mozilla.org, where this McAfee add-on has been added to a block list:
 https://addons.mozilla.org/en-US/firefox/blocked/i42