Closy

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由 Roi-de-rats 发表于 Oct. 27, 2008 · 永久链接

As Closy 1.4.0 seems to disappear from time to time with FF 3.0.x, I dug compiled version 1.5.0 which seems to work perfectly. It can be found here:
http://downloads.mozdev.org/closy/closy-150.xpi
I have no idea why it's not made officially public but the page offers a version over 2 years old. Likely the author is not happy with it, but I am :)