Running TB 52 portable and getting this message every time I try to reply to an email on FF Portable pages. Task manager has only 1 instance running and closing the single running app lets me reply. Tried running FF in safe mode with add-ons disabled, no change. Any ideas? Thank you
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You've set Thunderbird to be your mail client but it's associated thunderbird.exe at the system level. This means that Thunderbird tries to start in local mode with a profile in APPDATA but sees another copy of Thunderbird is already running. You can manually set ThunderbirdPortable.exe as your mail client within Firefox itself. Follow the directions here: https://portableapps.com/support/firefox_portable#mailto
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