If you do not want that URL public, you will need to edit it out of your post...

I don't understand why there are so many different T3 script files. However, the one on the Blog page has a script error that appears to be killing the menu.

This is from the error console, with the host name sanitized:

Timestamp: 3/20/2013 2:33:16 PM
Error: SyntaxError: invalid increment operand
Source File: http://yoursite/t3-assets/js_a8b51.js
Line: 853, Column: 60
Source Code: x.uniqueId=function(e){var t=""+++P;return e?e+t:t}

(Firefox flags the +++)

Firefox Error Console:

Tools > Web Developer > Error Console

Click the Errors button to filter out all the style warnings.

You will have to change the "+++P" to + "+ ++P" or "+(++P)" (add a space or braces to distinguish the ++ operator) to make this work.

I found that line of code and changed the +++P to +(++P).

This had no effect.

Another way to interpret the error is that the invalid operand is P. But... untangling to script to figure out why P might be invalid is not going to be easy. Can you get vendor support on your template?

Yes, I can get vendor support, but the bigger question is why every other browser I tried does not have this problem?

I also have a new Kindle Fire, and it has two browsers installed, neither one shows this problem with my menu. This points strongly to Firefox.

I will toss the question to JoomlArts to get their reaction.

Well, I got JoomlArts to look at the menu problem with Firefox. They made an adjustment and it now works. I asked for details, but have not received a reply.

I have a little more information concerning Firefox performance. My Firefox problem was discovered on PCLinuxOS. I don't use their package version, but rather your download for Linux that connects to the update channel. It was (is) the latest version of Firefox. I also tried the Windows 7 version of Firefox (also the latest) and it also had the problem.

Now you may be interested in this. While investigating this menu problem with my website, I noticed something else about the Linux version of Firefox when looking at the website of a local restaurant. Firefox on Linux (both the package version and the update version) displays this website terribly, and Firefox on Windows 7 displays it just fine, as do other browsers. You might want to take a look.

http://www.olivesandpeppers.com/

Great to hear they have a fix.

Regarding the other sites, I don't have Linux, so...