Although apps get unique IDs and are isolated from each other. When you use your browser it's much easier to connect the dots. What you do want to be careful a

Although apps get unique IDs and are isolated from each other. When you use your browser it's much easier to connect the dots. What you do want to be careful about is following links from browsers that load applications, because they are typically tagged with information that links the app to the browser (and from there to everything else).