Here is a helpful tip lifted from the BOB 5.2.4 topic. It can help clean up damaged installations.
Abyss24 wrote:Update on BOB install issue: I was finally able to fix this.
I was unable to install BOB on my new computer despite trying all the suggestions: re-install Greasemonkey, clean reinstall Firefox, cut and paste the text field, etc.
What finally worked was" I clicked on "Help" in the Firefox menu bar and , then selected the second option "Troubleshooting Information", then lastly clicked the button at the top right "Reset Firefox". It saved my cookies and bookmarks, everything else was cleared out, including Greasemonkey, which did not occur when I ran the clean Firefox re-install. I then followed the install Greasemonkey and install BOB links provided at the beginning of this thread.
Just wanted to throw this out there for anyone else who may be having this problem. Ender 516: thanks for your help, you got me past the initial BOB install issue I was having that I couldn't figure out, just wanted to pass this fix on to you in case someone else runs in to this problem.