When Home Manager manages email accounts for Thunderbird, it is no
longer possible to create additional accounts through settings, as those
will be overwritten later by HM. This presents a problem for users who
want to use Thunderbird to read RSS feeds.
It may also be desirable to manage feeds declaratively as well. However,
Thunderbird seems to store feed configuration and state (e.g. last updated time)
in the same file. Because of this, declarative feed management for Thunderbird
seems infeasible at least.
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