Update Thunderbird or Firefox Despite Errors
After downloading a newer version of Thunderbird or Firefox and following the instructions, you may receive an error that you don't have sufficient permissions to move the program to the Applications folder. Try this:
- Quit the program you are trying to update.
- Navigate to your Applications folder and locate the current program.
- Drag that file to the trash.
- Now you can copy the new version to the Applications folder.