Sigh, we use: `let commandLine = Cc["@mozilla.org/toolkit/command-line;1"]` https://searchfox.org/comm-central/rev/753e6d9df9d7b9a989d735b01c8b280eef388bab/mail/components/compose/content/MsgComposeCommands.js#2676
And that XPCOM API has disappeared from M-C in bug 1491560: https://hg.mozilla.org/mozilla-central/rev/7a4dadc9c3e6
So we need to restore this.
Sigh, we use: org/toolkit/ command- line;1" ]` /searchfox. org/comm- central/ rev/753e6d9df9d 7b9a989d735b01c 8b280eef388bab/ mail/components /compose/ content/ MsgComposeComma nds.js# 2676
`let commandLine = Cc["@mozilla.
https:/
And that XPCOM API has disappeared from M-C in bug 1491560: https:/ /hg.mozilla. org/mozilla- central/ rev/7a4dadc9c3e 6
So we need to restore this.