Examine source code of Screen Break

{
  "manifest_version": 2,
  "name": "Screen Break",
  "version": "1.3",
  "description": "Remind you to take breaks at regular intervals to reduce eye strain.",
  "icons": {
    "32": "media/images/coffee32.png"
  },
  "permissions": [
    "notifications"
  ],
  "background": {
    "scripts": [
      "js/background-script.js"
    ]
  },
  "browser_action": {
    "default_icon": "media/images/coffee.png",
    "default_title": "Screen Break",
    "default_popup": "popup.html",
    "browser_style": true
  },
  "options_page": "options.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{fd41575a-e648-4384-a033-fb043b4641c4}"
    }
  }
}