User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0

Steps to reproduce:

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0

Steps to reproduce:

1. Open TB and select a message
2. Open TB error console to get the message URL by entering var hdr = gFolderDisplay.selectedMessage; alert(hdr.folder.getUriForMsg(hdr));
3. Open cmd.exe and run "thunderbird.exe -mail "<URL>"

Actual results:

Thunderbird doesn't open the message specified by the command-line parameter. Instead, the following error message in shown in the error console:

TypeError: setting getter-only property "_messenger": MailNewsCommandLineHandler.jsm:19:62 (get _messenger resource:///modules/MailNewsCommandLineHandler.jsm:19, handle resource:///modules/MailNewsCommandLineHandler.jsm:69)

Expected results:

TB should open the message specified by the comman-line parameter.

As a workaround, one can adjust the MailNewsCommandLineHandler.jsm by inserting the follwing code after line 22:

set _messenger(value) {
return value;
},

Learn something new every day...

Pushed by mkmelin@iki.fi:
https://hg.mozilla.org/comm-central/rev/3d401dc2c803
Open message from command-line using -mail <URL> parameter throws TypeError (getter-only). r=lasana

Comment on attachment 9199599 [details] [diff] [review]
bug1684756__messenger.patch

[Approval Request Comment]
Regression caused by (bug #): unknown
User impact if declined: can't open specific url from command line
Testing completed (on c-c, etc.): beta
Risk to taking this patch (and alternatives if risky): low

Comment on attachment 9199599 [details] [diff] [review]
bug1684756__messenger.patch

[Triage Comment]
Approved for esr78

Thunderbird 78.8.1:
https://hg.mozilla.org/releases/comm-esr78/rev/d22a16e8406f