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I met the same issue and solved it.

It was caused by a variable called "i" which was wrongfully global in my code. Very classic mistake:

for(i = 0; i < max; i++) {

It did interfere with the minify version of jQuery which uses a variable named "i" that Firefox 3.6.18 considers as global for an unknown reason.

The same thing happens if you use a global variable name "quickExpr" with the uncompressed version of jQuery ("quickExpr" is the uncompressed version of "i").

That is why the problem happens only with minified versions, and only with specific Firefox versions.

Juste spent 2 hours on that one. Should use jslint...

So how did you resolve the issue? did you have to change your code, or the minified version of jquery?

I found the same issue too in FF 3.6.23, where the non-minified version worked fine.

To fix it, look for any "i" variables in your code and rename it to something else - i.e. iter

This cleared the issue and allowed the minified version to work again.

Typically the issue happens where jQuery is called in a scope where "i" is present (and I usually use "i" for loops - perhaps this could be corrected on the minifier?)

I'm confused. Neither quickExpr nor i is global even in the minified version of jQuery.

If it helps anyone, I had the same problem and after removing all instances of 'i' in my code finally traced it down to JQuery UI.

If I include jquery-ui-1.8.16.custom.min.js I get the problem - it I do not use jquery-ui-1.8.16.custom.min.js the problem goes away.

I love JQuery, but I have to ask - why on earth use i globally in your compressed library? It is just asking for trouble - IMHO this IS a bug and should be fixed.

Hi, I had such problem in FF 3.6.28 (and 1.5, 3.0.19). Fix - pack jquery.js with another packer. For example Dean Edvards packer., with unchecked "Base62 encode", "Shrink variables".