I used the instructions in the article, seems to have worked.
Firefox 3.5 on a Mac.
Which article? The one at How-To-Geek (main posting) or the one in #1 at the “clicky” link referencing OSX? I was looking at the one at the clicky link.
I don’t have 3.5 yet, but updates are inevitable. I don’t know how to comment out things though.
Eventually I’ll have to do this on a PC for my sister, also.