can any share your config files ?

[lifeike]

just share it as an exmaple.

[JohnPettigrew]

Here's part of mine. These entries let me navigate the email list and message preview entirely from the keyboard, which made a big difference to Thunderbird's usability for me. (NB The alt+left and alt+right entries are javascript, so require tbkeys rather than tbkeys-lite.)

    "alt+left": "window.document.getElementById('threadTree').focus()",
    "alt+right": "window.document.getElementById('messagepane').focus()",
    "alt+down": "cmd:cmd_nextMsg",
    "alt+up": "cmd:cmd_previousMsg",

[ig3]

I just figured out settings for 'Compose key bindings' to swap cmd_paste and cmd_pasteNoFormatting, because I really don't like pasting with formatting by default.

{
  "ctrl+v": "cmd:cmd_pasteNoFormatting",
  "ctrl+shift+v": "cmd:cmd_paste"
}

Seems to work in Thunderbird 91.4.