Is there a solution to the duplicate RSS feed entries (2022 and beyond)?
Has clearly been a long-standing issue, first reported in 2008 [on Stack Overflow](https://stackoverflow.com/questions/182615/why-does-my-rss-feed-duplicate-some-entries) (see [this answer](https://stackoverflow.com/a/48707313) for more information). Based on my experience some feeds have been affected as long as I've used Thunderbird, for instance [this custom RSS feed-creator for Reddit](https://github.com/johnwarne/reddit-top-rss) frequently pulls duplicate entries.
Is there any built-capability to remove (and mark as read, if needed) these "copies", for instance by matching any messages with an identical body? An addon is also an acceptable method, if there's one compatible with Thunderbird >100.
Modified by user