Assuming no other chrome-specific vulnerabilities, the same PoC can also be implemented for Firefox because it allows temporary installation of unsigned addons.

Assuming no other chrome-specific vulnerabilities, the same PoC can also be implemented for Firefox because it allows temporary installation of unsigned addons. Besides, I'm not arguing that extensions can't be malicious. Also, I fail to see how the existence of a malicious extension PoC translates "Chrome definitely has a problem with malicious browser extensions". I'm sure you're right about malicious actors not overlooking extensions, yet here we are with virtually everyone using chrome and no wide-spread security issues to speak of. Proofs and pudding.