An anonymous reader writes "Google has begun blocking local Chrome extensions to protect Windows users. This means that as of today, extensions can be installed in Chrome for Windows only if they're hosted on the Chrome Web Store. Furthermore, Google says extensions that were previously installed 'may be automatically disabled and cannot be re-enabled or re-installed until they're hosted in the Chrome Web Store.' The company didn't specify what exactly qualifies the "may" clause, though we expect it may make exceptions for certain popular extensions for a limited time. Google is asking developers to reach out to it if they run into problems or if they 'think an extension was disabled incorrectly.'"