Well ericsavics is a crypto enthusiasts since 2013, but he still doesn't know how to prevent from phishing attack. Also, hardware wallet never ask to write seed in your PC. The most important thing is you shouldn't only trust the extension if it's listed on Google, because listed on google is not mean the extension is 100% safe, you need to check in their official websites too. It's better to download from their official websites rather than on google.

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Anyway this thread has been discussed before Be Careful Fake Keep Key Chrome Extension

Sadly there isn't a way to recover those hacked Bitcoin it would also be hard to trace those hackers.
And I think he isn't the first and wouldn't be the last to fall victim of this phishing sites or chrome extension.
We should be aware of what we are downloading or visiting specially if we hold a huge amount of crypto don't just click or install anything you want always check if they are safe to use and doesn't have any virus.

For investors who has this kind of big amount, it's better have a dedicate computer to access the hard wallet as we never know what program is malicious or not. 12 btc is already a huge amount and will be bigger in the long run as bitcoin is expected to rise, however I won't say that it's the end of his journey in crypto, hopefully he will learn from that and start accumulating again.

but 2013 up now, that really hurts, but that is the reality one needs to accept.  

I feel sorry for the guy, but we should all be more careful with the ways we store and use cryptocurrencies. In a modern world, the new thieves are the hackers and the best defense is to be informed with the latest security practices and I'd say that you can stay safe if you are careful with your internet activity. Double-check everything you click on and what you download.

Moreover, if you possess a significant amount of BTC and any other cryptocurrency I would recommend keeping them on a hardware or paper wallet.

I don't think it's possible for him to get those coins back, but it's really sad he lost them. It's very important to be careful with Bitcoin because there are many ways to lose coins. The only crypto-related Chrome extension I even installed was Metamask. I don't trust extensions and only install those which are very popular and reputable. I've seen such scam before with a casino claiming that one has to install an extension to get the money one won. Frequent hacks and scams is what makes me believe that a crypto insurance could become really popular, but it seems that entrepreneurs are not rushing to fill this market niche.

Give it up I suppose? I mean, we can all pity him all we want but really, those coins are lost. It's a fact that even though he's had 7 years of experience with Crypto, he still uses third party extensions to store his coins. Sure, the original KeepKey may be nice and all but really, it's that fact that managed to make him elude his notice and well, scam his coins. It's kind of hard to acknowledge Googles mistake here, yes, Google has some kind of responsibility for it since it accepted it as an extension, but it's not the first time Google has done this.

I understand, out of frustrations, he was trying to find a way to recover those stolen Bitcoin, but like the majority is suggesting, It's "almost" impossible to recover those.
I used the word "almost", because at least for the people like me, who aren't that tech savy or a computer wizard, It is impossible to recover stolen Bitcoin.

It's just so heart breaking to hear him speaking in front of a camera https://mobile.twitter.com/ericsavics1/status/1271589769336598528  
He was just trying to add extra layer of security, but It turns out that he has been stripped off from the security that he was looking for.

So, I guess this is gonna be another precautionary event for those who are fond of visiting crypto related websites.
I suggest, asking the community first when you're totally uncertain or having a doubt about a certain website and softwares.

I feel sorry for the guy.  Imagine it took him 7 years to accumulate that BTC and just a single mistake, all his BTC savings is gone.  I hope this serve as a lesson not only to him but to us as well.  That, we must stay vigilant at all times.  Never click any suspicious link or install any untrusted chrome extension.

Sadly for him, it is very hard to trace who stolen that Bitcoin and impossible if it went through mixers.

I think this is why more and more hardware wallet manufacturers and developers are working on their own third party Apps now... and not going for browser extensions anymore. The problem I see with this is the proprietary code being used by these developers. If they use Open source code, people know what they are getting.

I also nearly lost some coin with my Ledger wallet, when a hacker replaced my App with his own fake App. Things looked different and I checked with the site and I saw that there was no updates and that I was running the latest App... so I knew something was fishy. (The about option went to a error message) 

The guy should also not have stored all his coins in one wallet. (very noob mistake)