Hey there! If Facebook is saying that they don't support the game, that means Facebook no longer has allowed the functioning of that game on Facebook. You won't be able to play Words With Friends on Facebook anymore. I also highly recommend contacting Facebook support or [https://zyngasupport.helpshift.com/hc/en/63-words-with-friends-2/faq/12161-how-do-i-contact-customer-support-from-within-the-game/ Zynga support] (the developer of Words With Friends) as this isn't Firefox related. Hope I helped! Bithiah

Any relevant-looking messages in the Web Console ? *"3-bar" menu button -> Web Developer or Tools -> Browser Tools -> Web Developer Tools *https://developer.mozilla.org/en-US/docs/Tools/Web_Console