Yes, Hola’s Chrome extension was hacked in 2018. The hack targeted users of a specific cryptocurrency. Hola fixed the problem. Although most VPNs offer browser extensions, extensions generally aren’t necessary. They are a security risk and can slow the browsers. In August, Google had to remove five browser extensions from its Chrome Web Store because researchers found that those extensions tracked users’ browsing history and paid the perpetrators affiliate marketing commissions if people with those extensions bought something from specific ecommerce sites.