[pabianice]

>>Open the Firefox browser. Click “Tools” on the top navigation bar, then click “Disable Script Debugger.”

No such option. Next?

[rockrr]

I use Pale Moon which I assumed was similar in layout to FF (you know what they say about assuming?!)

Try the instructions from this link:
http://smallbusiness.chron.com/stop-script-errors-firefox-48954.html

I tried this with PM and it worked fine.