Copy your current profile onto a thumb drive. Next; open your file browser to the '''New''' profile; Type '''about:support''' in the address bar and press enter. Under the page logo on the left side you will see '''Application Basics.''' Under this find '''Profile Folder.''' To it’s right press the button '''Show Folder.''' This will open your file browser to the current Firefox profile. Now '''Close Firefox.''' -------------------- Second, open the file browser to the Old profile. Right click on that folder and select '''Open In New Window.''' '''Warning ! !''' Only '''Copy''' the files you are told. We will avoid anything that might cause you problems. Here is the list of files; cookies: Do not bother. Cookies will be created when you return to the web site. However, you will have to log in everywhere. extensions(add-ons): it would be better to download them fresh. ========================== key3.db and logins.json: These are the Password files. persdict.dat: custom dictionary – words you added to the dictionary mimeTypes.rdf: What to do with what type of file. places.sqlite: History and Bookmarks. prefs.js: Your settings. '''Note,''' this may be contaminated. -------------------------------- '''Copy''' these files from the old to the new. You will get a message about the files already exist. Choose to over-write for each file.