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由 Astara 发表于 Aug. 7, 2009 · 永久链接

Do not install this unsupported extension.
The author has abandoned it and left it as a copyrighted (unable to be taken over by anyone else) project -- it has noticeable and severe limitations (though it still works), but you will regret using it.

Try the 'alternate' Remove messages - a (forced) rewrite from scratch because this one was copyrighted, that was published under an open license and is being maintained and extended -- this one took me *hours* to process duplicates in a tiny window...

It really should be removed as no-longer maintained.. (and a closed-source license -- even though you can look at the source).