Check for a websites status over time.
Site Status Checker (SSC) allows you to have Chrome worry about checking if a website is available again with a valid status code.
Simply click SSC in the toolbar when you're on a site that's not behaving, specify the status code that is happening (ex. 404, 803, etc.), specify a poll interval in seconds (default to 300 seconds or 5 minutes), and click "Start Polling".
Once the website is no longer giving that status code, it will notify you with a simple notification, clicking it will bring you back to the previously misbehaving website.
Note: The minimum poll interval is 5 seconds. This is to try to keep the interval down to a human like level, as SSC does not want to be used for any form of illegal or mischievous activities.