So looks like Greasemonkey changed the way I was supposed to save things within Firefox which prevented the KillFile from being updated. Quick fix and it looks like we are back in business :)
Here is the link to the updated script.
If you need to clear your old kill list completely just type about:config into the address bar and then seach for killfile – right click and reset that to clear your list.
1 Comment for Google Groups KillFile 3.5.3 Released
Modemac | December 11, 2009 at 3:03 pm
Is there a way to format the script so as to examine the message headers of a Usenet post, and remove cross-posted messages? This would be greatly appreciated, as it would allow us to killfile those huge trolling cross-posted threads that go across many different newsgroups.