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How do I make Firefox pop up something on every Javascript error? I don’t want to use add-ons for this basic functionality, I don’t need fancy debugging or anything, just to immediately see if there’s a Javascript error and on which line it is.
I tried about:config and setting devtools.errorconsole.enabled to true, but it still won’t report errors (IE and Opera do).
Hit Ctrl-Shift-J and you’ll get the error console. That should be all you need, right? You can see every error as it occurs in a separate window, along with its line number.