I know this is a long shot, but I'm going to post it anyway.
I am using a newly-downloaded Firefox 3.0 on my MacBook, running OS 10.4.11 (after a weird glitch wherein the older version of the browser froze, and when I did a force quit, the application was GONE from my Mac entirely), and the new version of Greasemonkey (Version 0.8.20080609.0, released June 12, 2008) won't download or install.
Every time, I get an error message, and the error console tells me this:
I'm not a developer (not by a long shot) so I don't know what all of that means, but I knew enough to use Greasemonkey's last version to put a kickass sig line in my Gmail:
and now I have NO IDEA what to do.
My writing clients all told me how much they loved my sig line and I'm really frustrated that I can't use it anymore.
I left this post as a comment on the Greasemonkey blog, hopefully someone will be able to tell me something.
Anyone have any tips?