Work with the simple-prefs module and export the values to a script stored in the data folder - firefox-addon

Question

I'm currently trying to add some preferences to a Firefox add-on. To do so, I'm playing with the new "simple-prefs" module. (Simple-Prefs on the Mozilla Blog)
The documentation is not very detailed and I face some problems understanding how I can retrieve the value attached to an option and export it to a JS script present in my data folder.
Let's say that I have only one optional setting in my addon, a boolean one, then my packages.json will look like this:
{
"name": "test",
...
"preferences": [{
"type": "bool",
"name": "option1",
"value": true,
"title": "Desc Option 1"
}]
}
Here is my main.js file [UPDATED]:
var pageMod = require("page-mod");
const data = require("self").data;
const prefSet = require("simple-prefs"); //Simple-prefs module
var option1 = prefSet.prefs.option1; //get the value for option1
function onPrefChange(prefName) { //Listen for changes
var prefName = prefSet.prefs[prefName];
}
prefSet.on("option1", onPrefChange);
exports.main = function() {
pageMod.PageMod({
include: ["https://mail.google.com/*","http://mail.google.com/*"],
contentScriptWhen: 'ready',
contentScriptFile: [data.url("jquery.js"),data.url("script.js")],
onAttach: function(worker)
{
worker.postMessage( option1 );
}
});
}
How can I retrieve the value attached to "option1" and export it in order to call it in my "script.js" file?

Answer 1

As usually, content scripts don't have access to the API - they can only receive messages from your extension's scripts. Here you would do:
pageMod.PageMod({
include: ["https://mail.google.com/*","http://mail.google.com/*"],
contentScriptWhen: 'ready',
contentScriptFile: [data.url("jquery.js"),data.url("script.js")],
onAttach: function(worker)
{
worker.postMessage(backtop);
}
});
And in the content script you would have the following code:
self.on("message", function(data)
{
alert("Received option value: " + data);
});
This message arrives asynchronously meaning that your content script won't know the option value initially - but that's how content scripts work.