Firefox extension js error log, where?

Question

I just started getting into Mozilla Firefox extensions, and I'm sure I'll do a lot of mistakes, but I am unable to find errors nor logs from my extension's javascript.

My main.js:

var pageMod = require("sdk/page-mod");
var self = require("sdk/self");

pageMod.PageMod({
    include: "https://www.google.ee/*",
    contentScriptFile: self.data.url("popup.js")
});

where in popup.js I tried Application.console.log("message"); Firebug.Console.log("message"); console.log("message"); Components.utils.reportError(e); randomly deleted some semicolons and tried calling for object properties that do not exist (document.body.asdasdasd="asd"; etc.)
[popup.js also inserted message into page body, so I can confirm the code was executed]

I have checked Ctrl+Shift+k; Ctrl+Shift+j; Firebug's console, all of them are empty or show errors from webpage only. In my about:config extensions.logging.enabled=true and javascript.options.showInConsole=true.

What could I be missing or where do extension javascript logs appear?

Answer 1

There are a few ways this can be set

1. define JPM preferences

create firefox-prefs.json with your defined preferences.

{
  "extensions.sdk.console.logLevel": "all"
}

then include it with your command line call

jpm --prefs=./firefox-prefs.json test

2. Define the preference in your code

using the preferences service include the following at the top of your index.js, lib/main.js or test/helper.js

require("sdk/preferences/service").set('extensions.sdk.console.logLevel', 'all');

3. Manually configure the preference in your browser about:config.

   1. visit about:config
   2. right click > New > String
   3. enter preference name 'extensions.sdk.console.logLevel' with value 'all'

Source:

Answer 2

Make sure you don't have your logging level turned off:

extensions.sdk.console.logLevel

Logging Levels

Answer 3

You have to enable addons logging and make sure you read logs on the Browser Console instead of the Web Console (see my answer here).