So if you go to about:config and set the javascript.options.strict pref,
you'll get warnings about accessing undefined properties.

    js> Math.TAU
    undefined
    /!\ ReferenceError: reference to undefined property Math.TAU

(It says "ReferenceError", but your code still runs normally; it really is
just a warning.)

Is anyone using this? Bug 1113380 points out that the rules about what kind
of code can cause a warning are a little weird (on purpose, I think). Maybe
it's time to retire this feature.

    https://bugzilla.mozilla.org/show_bug.cgi?id=1113380

Please speak up now, if you're still using it!

-j
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