Angry Birds Friends in not working after the auto update to version 50.0. The error is This application is not correctly embedded (wrong vmode value).
This application worked before the update to version 50.0. It has occurred in the past and "magically" seems to repair itself.
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This game is advertised as only compatible with mobile devices, or on Facebook. Please make sure that your Adobe Flash Player has been updated.
I would be curious to see if this suggested solution may work: the last post of questions/1121491
My last troubleshooting step would be to try the beta channel as suggested in the thread above. Please post back with your results.
I tried updating Flash player to no avail. The other suggestion in the post you suggested did nothing. This is a Facebook application. It works with other browsers and worked before this update. Eventually, someone will fix the issue and it will work again. Other Facebook games work. It is a level of frustration that I have with Firefox.