What are the circumstances under which you get this error?

Does it help if you clear your download history (see first section of this article: What to do if you can't download or save files)?

The circumstances are downloading a file. My browser pretty much locks up any time I download a file be it a small jpeg or a large exe. I used to get a pop-up window alerting me that the script in my first post had stopped responding and gave me an option of ignoring or stopping it. Once stopped downloads would be fine until I restarted firefox and again got the notice (I don't always get the notice, but I do always get the lock-ups).

It happened this time when I had stuff in my download history, it was about 25 files.

I am going to restart and try downloading the file again that gave me the script stop with my download history clear and will report back here.

[edit]No luck getting a lock up again just yet. I will do some more testing with a full download history and without it full.

Is there any where that I can just disable this script all the time? I've looked for it in about:config and don't see it there.