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sudo nano /usr/share/xfce4/helpers/betterbird.desktop
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[Desktop Entry]
Version=1.0
Icon=betterbird
Type=X-XFCE-Helper
Name[am]=Betterbird
Name=Betterbird
Keywords=email;mail;inbox;message;communication;
StartupNotify=false
X-XFCE-Binaries=flatpak run eu.betterbird.Betterbird;
X-XFCE-Category=MailReader
X-XFCE-Commands=%B;
X-XFCE-CommandsWithParameter=/usr/lib/xfce4/xfce4-compose-mail flatpak run eu.betterbird.Betterbird %B "mailto:%s";/usr/lib/xfce4/xfce4-compose-mail flatpak run eu.betterbird.Betterbird %B "mailto:%s";
menu->Default Applications
choose "other" for mail reader and paste in the following
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flatpak run eu.betterbird.Betterbird "mailto:%s"
REBOOT
Open your browser and go to the Betterbird support page. Find the "Contact us" link in the text.

Click it. You should see an email edit window open with To and Subject filled in.