The Conceivably Tech blog pulls the highlights out of Mozilla's UX Design team notes to provide a glimpse at what's planned for Firefox 5 (or, potentially, 6 or 7). We've previously seen some big ideas from Mozilla; this preview looks at a few key features, including an identity manager that could allow for multiple, simultaneous sign-ins, a social sharing tool, and previews of files, including PDFs. [Conceivably Tech]