Computer software, systems and methods for providing context personalized browsing over computer networks. In the foregoing, an intelligent agent referred to as a “browser companion agent” includes a service component for holding one or more service modules that may assist a user by providing services that are contextually relevant to content on a browser on the user's computer system. The agent also includes a data component for holding data objects related to and sharable by one or more service modules. The agent further includes a tracking component for tracking the pages on a browser and for communicating browser page data to a remote computer system that may respond to the agent with data or code for use by service modules. Contemplated service modules include a comparison shopping service, a transaction tracking service, and automated form filling service.