This extension is an implementation of IE8 Activities for Firefox (and Flock).
Añadir a Firefox
Activities is a new feature in IE8 beta.
You can get more information after the line
Internet Explorer8 beta (Readiness Toolkit)
Accelerators allow users to find information without leaving the current webpage. For example, to determine the location of a specific restaurant, a user will select the restaurant's address, generating an in-place view of the map. Clicking the view will open a full webpage that includes additional information from the mapping service.
Users can manage Accelerators and install them from the Internet Explorer Gallery or through any website that offers Accelerators for download. For more information, see Faster and Easier