We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window." I don't have Thunderbird on my laptop!

  • 1 reply
  • 1 has this problem
  • 5 views
  • Last reply by Matt

mamaduck
mamaduck
more options

I'm trying to install Thunderbird on my new laptop and I keep getting this message. There is no "old Thunderbird." I've purged all cookies. There is no program labeled Mozilla or Thunderbird on my computer. I used Thunderbird on my old laptop, but if I can't find a solution quick-time, I'll go with another mail program. Please help!

I'm trying to install Thunderbird on my new laptop and I keep getting this message. There is no "old Thunderbird." I've purged all cookies. There is no program labeled Mozilla or Thunderbird on my computer. I used Thunderbird on my old laptop, but if I can't find a solution quick-time, I'll go with another mail program. Please help!

All Replies (1)

Matt
Matt
  • Moderator
  • Top 10 Contributor
more options

you might not have done installing, but obviously there is a process running, probably part of a failed install. Did you try rebooting to clear the memory of failed applications. It is usually a quick fix for this sort of error.