HTTP Switchboard is a Chromium browser extension (which also works with other Chromium-based browsers such as Opera (from version 15) and the Yandex browser) that allows filtering of Hypertext Transfer Protocol (HTTP) requests based on the content and/or the target's domain name. It comes with an optional, pre-defined blacklist of hostnames that might be a privacy threat when sending requests to them and/or a security threat/annoyance due to the content delivered in the response.