Related link: http://www.mozilla.org/products/firefox/
I upgraded to Firefox 0.9 yesterday. I followed the instructions to install it (drag it into the applications folder), but it did not copy my preferences and bookmarks like it should have (and said it would). The “File> Import…” menu option seemed to do something although I am not sure what.
No matter: the Firefox team explains the change in the release notes. In previous versions, the profile folder is in ~/Library/Pheonix/Profiles, and in 0.9 it shows up in ~/Library/Application Support/Firefox/Profiles.
I copied my old profile folder (all of which have hard to guess names like “wf4na7m9.0ls”) to the new location, then edited the ~/Library/Application Support/Firefox/profile.ini file to change the name of the default profile to the one I just copied.
Everything seems to be working fine. My bookmarks and cookies show up like I expect them. Once the initial flood of downloads end, I will reinstall the plug-ins too.