I'm using Thunderbird as my feedreader, but a lot of my long feed list is partially offline. Is there a addon or something similar to find that offline feeds und delete them from my feed-list?

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By offline do you mean sites that are no longer around or just down? – random Apr 24 '10 at 10:23
Sites that are no longer available. But that's not so important, I just wanted the list with the sites that are (currently) down. – Poru Apr 25 '10 at 7:07
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