> is there an easy way to verify it?

No, because they don't enforce their rules against obfuscation.

Even if there was it wouldn't help you - extensions regularly get sold to scammers who can push whatever update they want. I documented an extension with a few hundred thousand install base, that got sold and turned into malware. Overnight went from tens of lines of code un obfuscated to 10k+ lines obfuscated. Then they flooded the extensions review pages with fake reviews to burry complaints. I got a ticket open thru a contact which to Google's credit they investigated but they decided it wasn't violating enough policies to take any action.