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Re:Firefox Launches More Experimental Features by veeti on Sunday October 16, 2016 @08:10AM (#12718250)
There seems to be an about:config key for the backend, but I'm not sure if this is officially supported. The backend is open source [1].

[1] https://github.com/mozilla-services/pageshot

Re:Firefox Launches More Experimental Features by kuschku on Sunday October 16, 2016 @10:16AM (#12718667)
Actually, there’s even a setting in the settings menu of pageshot! http://i.imgur.com/NJI9FaN.png