How do I copy my existing Firefox profile to Pale Moon?
To migrate a Firefox or old (3.6.3 or earlier) Pale Moon profile (bookmarks, passwords, add-ons, etc.) to Pale Moon 3.6.6 or later, use the profile migration tool. This tool will copy the profile(s) from Firefox to Pale Moon 3.6.6+
If, for whatever reason, the tool doesn't work (properly), you will have to copy things manually. See this Troubleshooting section for help.