Google prevents automated queries Sorry.google.com is the page Google serves you (or an application) when you fail to answer it's human-verification question. Google has instituted this new policy - randomly checking to see if queries submitted to it (ie. searches) are done by human beings (as opposed to software applications). The purpose of this is two-fold. On the one hand, blocking the search query and redirecting the user to sorry.google.com alerts the user to potential spyware on their PC; on the other hand, it prevents users from utilizing software to query the Google search engine. Google protects you from spyware On the sorry.google.com page, you'll see Google recommending you run anti-virus and anti-spyware checkers. Why? If spyware is present on your computer, it may be accessing the Internet, and will often execute Google queries. If Google detects this, instead of giving the application what it's looking for, it will block the request and serve the sorry.google.com page instead. On this page you'll see recommendation for you to scan and clean your PC in the event of an infection.
This is done to stop repeated requests to the Google api. Generally it is triggered when an unnatural amount of requests come from the same IP address for APU queries, amongst other things. The Best thing to do to prevent it is to limit automated queries and disable any reporting tools you have in your browser in the event where you actively use Firefox based plugin tools.