Thunderbird: Allow saving login details for RSS Feeds to password manager

[nose_gnome]

It would be great if you could save the login details for a password protected RSS feed in Thunderbird, as currently it just asks you to re-enter you username and password every time you start up Thunderbird

One example of this issue is when I try to add an RSS feed for Pocket to Thunderbird, as it always asks me to re-enter my login details for Pocket when starting up Thunderbird.

I have included a screenshot of the window that opens every time I start Thunderbird.

Screenshot from 2023-03-07 15-15-16.png

[Jon]

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