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462 results. It is a major functionality issue with WA extensions that you will simply have to get used to because in my 4+ years of using them the situation has not improved at all.
Try it at Google: javascript error site:webassist.com
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You would be well advised to keep several working copies of your configuration folder so that the next time you install a new WA extension and find that half of your existing WA extensions have stopped working you will have a backup.
It's sort of like forcing us to type our email address and password every time we visit the site. Everyone knows it is a major annoyance but nobody is interested in fixing it.