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Which Firefox API can detect Firefox Warnings? to help trigger a .jpg of a Stop Sign? Coding in: XUL/JS Goal: to aid novice/elderly users avoid threats

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I would like to create an extension, which can be used to educate novice/elderly users about potential security threats. I am under the impression that most users do not fully understand Firefox security warning, and the threats these warnings are used to protect against.

I would like to create an extension, which can be used to educate novice/elderly users about potential security threats. I am under the impression that most users do not fully understand Firefox security warning, and the threats these warnings are used to protect against.

Chosen solution

See the Mozilla Developer Network (MDN) website. https://developer.mozilla.org/en-US/Apps/Reference

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Chosen Solution

See the Mozilla Developer Network (MDN) website. https://developer.mozilla.org/en-US/Apps/Reference

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The Add-ons site also has a forum where most likely they speak better XUL than we do here: http://forums.addons.mozilla.org/