Thank you very much ^^

I do not know how to contact Facebook

Is it in the account general settings?

Yes, account general settings Facebook

Currently I'm using Opera 46.0.2597.39 but still can not enable Auto play video on Facebook, I use Firefox 54.0.1

I use Opera 46 and do not use Extensions, I do not use Native adblock, I use Opera with the default settings, this is a snapshot of the video settings on Facebook of Opera and Firefox.

http://imgur.com/a/l7mZY

When using Firefox, you can enable Autoplay video + gif, but when using Opera, Chrome can not do that, when using Firefox in the video settings have the option to enable / disable autoplay. Opera, Chrome, in the video settings of Facebook does not have this option.

Opera can port addon S3.Google Translator from Firefox to Opera? I do not know English, so to read English news I need to use Google Translate, but Opera does not have a good extension that supports auto-translated languages similar Chrome or Firefox with addon S3.Google Translator