Data loss warning: If you use a profile with this or any later version and then try to go back to SeaMonkey 2.49 or earlier, SeaMonkey will rename your bookmarks and history file to places.sqlite.corrupt and create a new places.sqlite file, effectively resetting your browsing history. This is because the internal format changed and the upgrade process only works in one direction. Additionally, running MailNews with local folders and POP3 mail filters may produce summary files that are not correctly read by previous versions of SeaMonkey. If you decide to go back to a previous version of SeaMonkey, you should do it from a profile backup only.