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For those of you still using Magento 1.5, you may have noticed that trying to find elements by their class name from the context of an element (jQuery("anything").find(".class")) stopped working in FF 20.
After filing a bug report with Mozilla, it was determined that there is a specific function in the prototype deprecated library which converts element.getElementsByClassName() into an empty function in firefox alone. This wasn’t a problem before due to the way getElementsByClassName was handled previously, but FF had to implement a major fix to that function due to issues which, combined with this library, creates the above issue.
To fix the problem, search your prototype-deprecated file for the following block and remove it:
message: ‘Element#getElementsByClassName has been deprecated, please use Element#select instead.’