If you’re feeling like Thunderbird is taking up too much space on your hard drive, deleting your profile is an easy way to free up some space. Here’s how:

  1. Open Thunderbird and click the menu button (three lines in a row at the top of the window), then choose “Profile.”
  2. In the “Profile” window that pops up, click the “Delete Profile” button.
  3. Confirm that you want to delete your profile by clicking the “Yes” button. ..