@yaute didn't work. I am running Manjaro with the latest Opera.
I mean ffs this issue has been plaguing Opera for years, years and nobody does a thing. Netflix does not work on Opera (Linux) out of the box and this is the only single reason why I don't use this browser. I can understand that Opera does not give a damn for those poor 3% Linux users. But please do invest some of your precious time to write at least a tutorial or howto or am I asking too much?

One of the reasons why Opera is a bad browser for Linux and why nobody from common users will ever stay with it long enough to make it their default is the fact that Opera does not come with out-of-the-box support for various video streaming formats. I have just installed 43 version to see what's new cool stuff has been added only to find out that I still can't play flash videos from the web sites and some videos on youtube: "Your browser does not currently recognize any of the video formats available".
So, imagine a typical user that sees this message on his favorite youtube or whatever. His next reaction will be "ok, I'll try something else, uninstall", he does not care about why and what, he wants things done. Well, if this user really likes Opera features, he'll go to "support & help" section on opera.com and try to figure out what's wrong there. He'll find out that "You just need to install the latest Adobe Flash Player." But I have already installed it "flashplugin 25.0.0.127-1 [installed]" so what am I missing? He will probably try and google posts dating from 2009, 2012, 2014 which involve some console magic skills, library mangling and other voodoo stuff. Will he even understand what is going on? Eventually he will give up and drop it.
So, my point is. It is 2017 and I see that nothing changed, same problems as in 2014, 2015, 2016, I still can't watch most videos from the Internet on Opera. I don't care what other "killer" features it might have, because in truth, it simply doesn't, all browsers more or less packed or can be extended with plugins.
With this post I am not seeking answers, I don't want to open a console and start debugging why something does not work when it should. I am just giving your feedback.

Oh and btw, I have installed vivaldi which is not even in the official repos and it works, videos are all getting played correctly. I didn't have to browse through numerous web sites in search for solution. Why is that, I wonder?

@yaute didn't work. I am running Manjaro with the latest Opera.
I mean ffs this issue has been plaguing Opera for years, years and nobody does a thing. Netflix does not work on Opera (Linux) out of the box and this is the only single reason why I don't use this browser. I can understand that Opera does not give a damn for those poor 3% Linux users. But please do invest some of your precious time to write at least a tutorial or howto or am I asking too much?

One of the reasons why Opera is a bad browser for Linux and why nobody from common users will ever stay with it long enough to make it their default is the fact that Opera does not come with out-of-the-box support for various video streaming formats. I have just installed 43 version to see what's new cool stuff has been added only to find out that I still can't play flash videos from the web sites and some videos on youtube: "Your browser does not currently recognize any of the video formats available".
So, imagine a typical user that sees this message on his favorite youtube or whatever. His next reaction will be "ok, I'll try something else, uninstall", he does not care about why and what, he wants things done. Well, if this user really likes Opera features, he'll go to "support & help" section on opera.com and try to figure out what's wrong there. He'll find out that "You just need to install the latest Adobe Flash Player." But I have already installed it "flashplugin 25.0.0.127-1 [installed]" so what am I missing? He will probably try and google posts dating from 2009, 2012, 2014 which involve some console magic skills, library mangling and other voodoo stuff. Will he even understand what is going on? Eventually he will give up and drop it.
So, my point is. It is 2017 and I see that nothing changed, same problems as in 2014, 2015, 2016, I still can't watch most videos from the Internet on Opera. I don't care what other "killer" features it might have, because in truth, it simply doesn't, all browsers more or less packed or can be extended with plugins.
With this post I am not seeking answers, I don't want to open a console and start debugging why something does not work when it should. I am just giving your feedback.

Oh and btw, I have installed vivaldi which is not even in the official repos and it works, videos are all getting played correctly. I didn't have to browse through numerous web sites in search for solution. Why is that, I wonder?