Although the names are similar, the Java add-ons are not used by Firefox to interpret and run JavaScript. Firefox handles JavaScript directly; you do not need Java for that. You just need to make sure JavaScript is enabled here:

orange Firefox button (or Tools menu) > Options > Content

When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(1) Bypass Firefox's Cache

Use Ctrl+Shift+r to reload the page fresh from the server.

Alternately, you also can clear Firefox's cache completely using:

orange Firefox button (or Tools menu) > Options > Advanced

On the Network mini-tab > Cached Web Content : "Clear Now"

If you have a large hard drive, this might take a few minutes.

(2) Remove the site's cookies (save any pending work first). While viewing a page on the site:

• right-click and choose View Page Info > Security > "View Cookies"
• Alt+t (open the classic Tools menu) > Page Info > Security > "View Cookies"

Then try reloading the page. Does that help?

It's possible that one of your other add-ons could be interfering, although I don't know why it would. To test that theory, you can disable all your nonessential, unrecognized, or unwanted add-ons on the following pages:

orange Firefox button (or Tools menu) > Add-ons > Plugins category
orange Firefox button (or Tools menu) > Add-ons > Extensions category

After restarting Firefox, do you notice any difference?

also see:

Firefox hangs or is not responding - How to fix

Thanks for the info. Actually, I think I've found my problem. Under the Content tab/Java, I hit the advanced button and there are three options. One of them is to disable content menus. I unchecked it and it seems to be working now. Thanks again for responding.