Firefox Addon: how to remove preferences when addon is being uninstalled?

Question

I have the following piece of code in my Firefox addon:

var firstrun = Services.prefs.getBoolPref(\"extensions.CustomButton.firstrun\");

if (firstrun) {
  /         


        

Answer 1

AddonManager.addAddonListener({
    onUninstalling: function(addon){
        // alert("uninstalling!");   
        Services.prefs.setBoolPref("extensions.CustomButton.firstrun", true);
    }
  });