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How to interpret JAVASCRIPT ERROR MESSAGES ?

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Javascript errors are trashing my FF sessions, routinely. Many, if not most, are Javascript errors associated with poor coding calling for Flash-related content.

Complicating matters, most of the Javascript error messages are not specific to the site where found, so that creates a problem in isolating the source of the bad Javascript code.

What I need is a tutorial on reading / interpreting Firefox error messages related to bad Javascript code. Specifically, instruction on how to determine what site produces the Javascript error. My interest is not debugging the code, although I have used the Firefox debugger in a vain attempt to determine the website origin of the Javascript error. All I need is to avoid the pages with poorly-constructed code.

Firefox, itself, counsels simply the process of elimination to determine the problem website source. But when I have many, many tabs open in one session, that process is impractical. The most direct avenue for determining the website source of a problem seems the Javascript error report Firefox already provides.

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