Methods and systems for associating, in a secure manner, a link between web sites (or other network resources) and installed applications. In one embodiment, a signed list of one or more URLs is downloaded and validated to establish an association, which is stored in a data structure, between a first application and a second application. In response to receiving a selection of a URL in the second application, comparing the selected URL to URLs in the data structure and displaying, in the first application, content of the selected URL in response to determining that at least a prefix portion of the selected URL matches one of the URLs associated with the first application in the data structure.