in other browsers like Firefox or Opera 12 I can see pages I visited before, offline, which are stored in the browser cache

please

It is better that Maxthon Opera ?, Why?

I use Opera for some time, but from version 15 lost many features, so I try to find a browser that looks like Opera 12

I have a fast connection, I do not need Turbo mode

I downloaded maxthon recently and I found it amazing, it has many extra features and is much more customizable than Opera, but the available extensions do not convince me. It is better that Maxthon Opera ?, Why?

opera://flags/#experimental-addressbar, what's this?

yes

I tried (opera://flags/#proprietary-media-types-playback) and nothing happened.
Also tried with Opera 25 dev. that includes MP3 support, but still not working.

The sound of this page does not work in opera, while in other browsers yes, why?
https://apps.facebook.com/triviacrack/