Hello,

I made an extension which must do an action when the user click on the
button ; I test with a display of a javascript alert when we click on
the button but it doesn't work.

The button is diplayed but on the click it doesn't display the alert
javascript.

I don't understand why.

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My file .xul :

xmlns="http://www.mozilla.org/keymaster/gatekeeper/
there.is.only.xul">