bonch writes: Firefox 13 beta has added a "Reset Firefox" button that migrates bookmarks, cookies, and other data to a new profile while deleting the old one. Add-ons and tabs do not survive the transition, though they may be supported in a future update. The feature is intended to avoid complicated troubleshooting steps and allow users to start over with a fresh installation of Firefox simply by visiting the Help menu. Link to Original Source
"The number of Unix installations has grown to 10, with more expected."
-- The Unix Programmer's Manual, 2nd Edition, June, 1972