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Click (Windows Explorer will open directly inside your active profile). Step 2: Copy the Data

Instead of relying on a , Mozilla recommends backing up your profile folder manually. This process captures 100% of your data without risking file corruption. Step 1: Locate Your Profile Folder Open Firefox or Thunderbird. mozbackup download

Go up one directory level in Windows Explorer so you can see the entire profile folder (it usually has a randomized name ending in .default or .default-release ). Right-click the folder and select . Click (Windows Explorer will open directly inside your

Open the application once to generate a brand new, empty profile folder, then close it. Step 1: Locate Your Profile Folder Open Firefox

Attempting to use a legacy on modern web browsers or email clients can result in severe profile corruption.

Bookmarks, browsing history, saved passwords, extensions, cookies, and custom preferences.