Thunderbird attachments are always opened in read only mode in 7.2 in Ubuntu Linux 20.04.
Steps to Reproduce:
1.In Thunderbird select an attachment, which will be opened by Libreoffice.
2.Double-click or right-click to open file.
Window asking to open read-only, notify or cancel appears.
File opens in edit mode.
User Profile Reset: No
OpenGL enabled: Yes
Version: 220.127.116.11 / LibreOffice Community
Build ID: 87b77fad49947c1441b67c559c339af8f3517e22
CPU threads: 8; OS: Linux 5.4; UI render: default; VCL: gtk3
Locale: lv-LV (en_US.UTF-8); UI: en-US
Thunderbird 78.13.0 (64-bit)
*** This bug has been marked as a duplicate of bug 143971 ***