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firefox does not verify epson web print, it has also taken away facebook app, rubbish, why?

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I have not been able to use epson web print for months, Epson is one of the biggest producers of printers in the world. Today my Facebook app just disappeared, I have removed it and reloaded it, restarted the browser, still no app, what is going on?

I have not been able to use epson web print for months, Epson is one of the biggest producers of printers in the world. Today my Facebook app just disappeared, I have removed it and reloaded it, restarted the browser, still no app, what is going on?

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Regarding the Epson add-on, if they have not provided an update and it provided important functionality that can't easily be replaced, you could consider using a different version of Firefox. Please see the last section of this article (for "Advanced Users"): Add-on signing in Firefox.

Is the Facebook app in Facebook itself, or is that a different add-on?