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Whenever I install Firefox, that's always the second extension I install (right after AdBlock).
Do you count the Automatic Filterset.G Updater as part of Adblock? That's always my second one. 
The bugmenot thing works awesome, so I had a look at the other Roachfiend plug-ins.
The one called Errorzilla looked really fantastic until I tried it and it didn't work because it's not fully implemented. It only replaces the "not found" page if your local firefox browser generates the error. If the server generates its own 404 page, you just get whatever the server showed. And I'm not even talking about custom 404 pages either, I mean just ultra plain "file not found" pages. Since most servers have their own pages (even plain ones), Errorzilla never appears. Ah well, was a great idea at first.