Firefox profiles are similar to user accounts in Windows operating system. Just like Windows operating system, Firefox uses accounts to save user data. In Firefox, user accounts are called profiles. A profile includes user information such as passwords, bookmarks, preferences, history, and other data. In addition to the default profile, you can also create more profiles, if you want. Mozilla Firefox saves all profiles in a location different than its install location. If you want to backup passwords, bookmarks, and other data without using any additional software, you can simply create a copy of your profile folder before reinstalling Windows operating system. In this guide, we will see how to open the Firefox profile folder in Windows 10 and earlier Windows versions. Method 1 of 3 Open Firefox profile folder using Run command Step 1: Open Run command box. To do so, simultaneously press Windows logo and R keys. Alternatively, type Run in Start/taskbar search and then press Enter key. Step 2: In the Run command field, type or paste the following path and then press Enter key to see your profile folder(s). %APPDATA%MozillaFirefoxProfiles Method 2 of 2 Open Firefox profile folder using File Explorer Step 1: Open File Explorer. Navigate to the following folder: C:UsersUserNameAppDataRoamingMozillaFirefoxProfiles In the above path, replace “C” with the drive letter of your Windows 10 installation drive and UserName with your user account name. Step 2: Under Profiles folder, you will see the folder(s) with some random letters. If you have more than one profile, all of them will appear here. Method 3 of 3 Access Firefox profile via Firefox browser If the profile folder is not present in its default location, you can use this method to know its current location. Step 1: Launch Firefox. Press Alt key on the keyboard to see Firefox menus. Step 2: Click the Help menu and then click Troubleshooting Information option. This action will open Troubleshooting Information page. Step 3: Here, under Application Basics, look for Profile Folder. Next to it, there is Open Folder button. Click Open Folder button to open your Firefox profile folder. Also read our how to upgrade Firefox 32-bit to 64-bit without reinstalling.