User-generated content in the spirit of Web 2.0 is a promising means to improve the search for relevant information on the web, particularly multimedia content. The idea is that user col-laboratively search or browse for information, either directly by communicating or indirectly by adding meta information (e.g., tags) to web pages. However, current solutions are bound to specific web sites providing such features. To overcome this limitation we introduce COBS, making Web 2.0 features available also for the 'old' web. In this demo we present the front-end, a browser add-on that enables users to tag, rate or comment arbitrary web pages and to communicate with others in both a synchronous and asynchronous manner.