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Old Firefox Data folder does not copy properly into new profile

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Basically title. I have the Old Firefox Data folder, but when I try to copy it into my appdata (both local AND roaming) nothing happens. My Old Firefox Data folder has another folder inside it containing all the data named g4xfs73z.default, which I haven't seen reference to on any forum. This name also does not match the name of my current profile folder. If I copy this folder in, nothing happens. If I copy the contents of this folder in, nothing happens. Any ideas?

Basically title. I have the Old Firefox Data folder, but when I try to copy it into my appdata (both local AND roaming) nothing happens. My Old Firefox Data folder has another folder inside it containing all the data named g4xfs73z.default, which I haven't seen reference to on any forum. This name also does not match the name of my current profile folder. If I copy this folder in, nothing happens. If I copy the contents of this folder in, nothing happens. Any ideas?
FredMcD
  • Top 10 Contributor
4248 solutions 59420 answers

First, Firefox profiles are created using a random string of numbers. So, 'g4xfs73z.default' would be a normal name.

Transfer User Profile Files https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

When you are ready, we can start moving parts of your old data and Copy it to the new profile.


First; open your file browser to the New profile;

Type about:support<enter> in the address bar.

Under the page logo on the left side, you will see Application Basics. Under this find Profile Folder. To its right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.

Linux: Under the page logo on the left side, you will see Application Basics. Under this find Profile Directory. To its right press the button Open Directory.


Second, open another file browser to the Old profile.

Open another file browser to the Old Firefox folder on your desktop. Then open the folder with the latest date.

Warning ! ! Only Copy the files you are told. We will avoid anything that might cause problems. Here is the list of files;

cookies: cookies.sqlite Do not bother. Cookies will be created when you return to the website. However, you will have to log in everywhere. And you may lose any settings that websites store on your computer.

extensions(add-ons, themes): it would be better to download them fresh. ++++++++++++++++++++++++++++++++ key3.db [v58+] key4.db and logins.json : These are the password files. Copy Both !

persdict.dat : custom dictionary – words you added to the dictionary

mimeTypes.rdf [v55+] handlers.json : What to do with what type of file.

places.sqlite : History and Bookmarks.

prefs.js : Your settings. Note: If you were having problems, this could be contaminated.

cert8.db [v58+]cert9.db and possibly cert_override.txt : Stores all your security certificate settings and any SSL certificates you have imported into Firefox. If removed, the cert8.db, cert9.db file will be replaced.

search.json.mozlz4 : file stores the user-installed search engines that are available in the Firefox v47+

search.sqlite file and searchplugins folder store the search engines that are available in the Firefox Search bar before Firefox v47 +++++++++++++++++++++++++++++++++++++++++++++++++ Copy these files from the old to the new. You may get a message that the files already exist. Choose to over-write for each file.

First, Firefox profiles are created using a random string of numbers. So, 'g4xfs73z.default' would be a normal name. '''Transfer User Profile Files''' https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles ''When you are ready, we can start moving parts of your'' ''old data and '''Copy''' it to the new profile.'' ------------------ First; open your file browser to the '''New''' profile; Type '''about:support'''<enter> in the address bar. Under the page logo on the left side, you will see '''Application Basics. ''' Under this find '''Profile Folder. ''' To its right press the button '''Show Folder. ''' This will open your file browser to the current Firefox profile. Now '''Close Firefox. ''' '''Linux: ''' Under the page logo on the left side, you will see '''Application Basics.''' Under this find '''Profile Directory. ''' To its right press the button '''Open Directory. ''' -------------------- Second, open another file browser to the '''Old''' profile. Open another file browser to the Old Firefox folder on your desktop. Then open the folder with the latest date. '''Warning ! ! ''' Only '''Copy''' the files you are told. We will avoid anything that might cause problems. Here is the list of files; '''cookies: ''' cookies.sqlite Do not bother. Cookies will be created when you return to the website. However, you will have to log in everywhere. And you may lose any settings that websites store on your computer. '''extensions(add-ons, themes): ''' it would be better to download them fresh. ++++++++++++++++++++++++++++++++ '''key3.db''' [v58+] '''key4.db''' and '''logins.json''' : These are the password files. '''Copy Both ! ''' '''persdict.dat''' : custom dictionary – words you added to the dictionary '''mimeTypes.rdf''' [v55+] '''handlers.json''' : What to do with what type of file. '''places.sqlite''' : History and Bookmarks. '''prefs.js''' : Your settings. '''Note:''' If you were having problems, this could be contaminated. '''cert8.db''' [v58+]'''cert9.db''' and possibly '''cert_override.txt''' : Stores all your security certificate settings and any SSL certificates you have imported into Firefox. If removed, the '''cert8.db''', '''cert9.db''' file will be replaced. '''search.json.mozlz4''' : file stores the user-installed search engines that are available in the Firefox v47+ '''search.sqlite file''' and '''searchplugins folder''' store the search engines that are available in the Firefox Search bar '''before''' Firefox v47 +++++++++++++++++++++++++++++++++++++++++++++++++ '''Copy''' these files from the old to the new. You may get a message that the files already exist. Choose to '''over-write''' for each file.