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

In my Add-On, where I set this on install:

const {Cc,Ci} = require("chrome");
var pref = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch);
pref.setIntPref("network.http.response.timeout", 3600*24);

I solved it like this, that in my main.js I added this code at the end:

exports.onUnload = function(reason) {
    //called when add-on is 
    //    uninstalled
    //    disabled
    //    shutdown
    //    upgraded
    //    downgraded
    pref.clearUserPref("network.http.response.timeout");
};

That worked on disabling and uninstalling the addon.

Note: this is still not perfect, see comments. I will have to work on this ...