Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Thunderbird won't open

  • 3 پاسخ
  • 3 have this problem
  • 21 views
  • آخرین پاسخ توسّط conorcorderoy

more options

I keep getting the following msg. on a M2 Mac Mini running Ventura: "A copy of Thunderbird is already open. Only one copy of Thunderbird can be open at a time." I've tried numerous suggested fixes with no success.

I keep getting the following msg. on a M2 Mac Mini running Ventura: "A copy of Thunderbird is already open. Only one copy of Thunderbird can be open at a time." I've tried numerous suggested fixes with no success.

All Replies (3)

more options

Have you tried deleting the .parentlock file?

http://kb.mozillazine.org/Profile_in_use#Remove_the_profile_lock_file

more options

That has happened to me. Tried the parentlock solution and tried ending the task. Only a reboot would solve it.

more options

Can't delete parent.lock because Thunderbird is still running.

I live in an area where there are occasional power cuts. Every time I get a power cut Thunderbird tells me it can't open because it is already running. I do the whole %AppData% thing and try to delete parentlock, and get a message saying I can't delete parentlock because...Thunderbird is still running. So I have to uninstall Thunderbird and reinstall it. I have had to do this four times already and nobody seems to have a solution.

I can't believe I am alone in having this problem. Can't the guys at Mozilla fix this? None of my other programs/apps have this problem.

Help, please,

Conor