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.

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.

Rohkem teavet

Can't start Thunderbird 45 and Firefox 46 simultaneously

  • 3 vastust
  • 1 on selline probleem
  • 12 views
  • Viimati vastas vincze.bela

more options

Since the last automatic updates, I can't start Thunderbird and Firefox simultaneously. If I start Firefox first, and Thunderbird after that, I get an error message "Thunderbird is already running, but is not responding. The old must be closed to open a new window." Pressing "Close Thunderbird" does nothing. If I start Thunderbird first and Firefox after, that I get an error message "Firefox is already running, but is not responding. The old must be closed to open a new window." Pressing "Close Firefox" does nothing.

Since the last automatic updates, I can't start Thunderbird and Firefox simultaneously. If I start Firefox first, and Thunderbird after that, I get an error message "Thunderbird is already running, but is not responding. The old must be closed to open a new window." Pressing "Close Thunderbird" does nothing. If I start Thunderbird first and Firefox after, that I get an error message "Firefox is already running, but is not responding. The old must be closed to open a new window." Pressing "Close Firefox" does nothing.

Valitud lahendus

Surprisingly, the profile folder for Firefox and Thunderbird is the same: "G:\mail". This is quite strange, as I use this folder as Thunderbird profile folder for years, but for Firefox, the profile folder was c:\user\user name\AppData\Roaming\Mozila\Firefox\Profiles\w5sjuxoc.default". I have no idea how did this happen (once, after the last update Firefox reset itself and I had to re-sync everything from the Firefox profile.) I created a new Firefox profile, copied the data and now the problem seems to be solved. Thank you for the help!

Loe vastust kontekstis 👍 0

All Replies (3)

more options

What is the profile folder for both, Firefox and Thunderbird? Please provide the full path, including the name of the profile folder.

At the top right of the Thunderbird window, click the menu button , then select Help > Troubleshooting Information > Profile Folder > Open Folder.

This will open the profile in Windows Explorer. Should work the same way for Firefox.

more options

Also do you have Thunderbird and Firefox installed into their own folders as done by default or installed into same folder?.

more options

Valitud lahendus

Surprisingly, the profile folder for Firefox and Thunderbird is the same: "G:\mail". This is quite strange, as I use this folder as Thunderbird profile folder for years, but for Firefox, the profile folder was c:\user\user name\AppData\Roaming\Mozila\Firefox\Profiles\w5sjuxoc.default". I have no idea how did this happen (once, after the last update Firefox reset itself and I had to re-sync everything from the Firefox profile.) I created a new Firefox profile, copied the data and now the problem seems to be solved. Thank you for the help!