The firefox 1.5 upgrade moves all the user settings and bookmarks to a backup directory and basically starts the user off with a fresh profile. Some people find this disconcerting and would like their settings back. Mozilla has a help page about settings files that is quite helpful. On my mom's linux system the settings file was slightly different, though. It is a file called prefs.js, not user.js as that page says. The bookmarks are in a file called bookmarks.html. Those two files were all that were needed to make my mom happy again!
cd ~/.mozilla_backup_200606062208/firefox/wrqqjf89.default
200606062208 is the date/time the software was installed, and wrqqjf89 will be different for other computers. It will be <some code>.default.
cp bookmarks.html ~/.mozilla/firefox/9g9jmv95.default/bookmarks.html
That will copy the bookmarks. Again the code preceding ".default" will vary.
cp prefs.js ~/.mozilla/firefox/9g9jmv95.default/prefs.js
That will copy the settings/preferences. That is not as important for many people, but the home page, etc are stored there.



