Examine source code of Moodle timer extension

{
  "manifest_version": 2,
  "name": "Moodle timer extension",
  "version": "1.1",
  "description": "Just a simple moodle timer extension",
  "icons": {
    "512": "icons/motivation.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/mod/quiz/attempt*"
      ],
      "js": [
        "timer_v2.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/motivation.png",
    "default_popup": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "moodle_timer@moodle_timer.com"
    }
  }
}