JS/ExtenBro.Agent.DJ. !
Someone stole my Amazon credentials one month after I've installed this extension... After a deep check of my OS with ESET and other security software, I really suspect that it could be happened through the Trojan inside this Opera extension...
The same happened 3 years ago to thousands of Chrome users when a Trojan inside Chrome Mega extension was found...
https://innov8tiv.com/chrome-extension-mega-is-a-trojan-horse-that-steals-your-cryptocurrency-when-installed-2/amp/
No 100% sure, but very high probability...