My shortcuts for thunderbird using tbkeys that generally try to add my Gmail habits, copy-paste into "main key bindings"
{
"j": "cmd:cmd_nextMsg",
"k": "cmd:cmd_previousMsg",
"o": "cmd:cmd_openMessage",
"f": "cmd:cmd_forward",
"r": "cmd:cmd_reply",
"a": "cmd:cmd_replyall",
"x": "cmd:cmd_archive",
"e": "cmd:cmd_archive",
"c": "func:MsgNewMessage",
"u": "tbkeys:closeMessageAndRefresh",
"[": "cmd:cmd_archive"
}