Examine source code of Whack-A-Post

{
  "manifest_version": 2,
  "name": "Whack-A-Post",
  "version": "1.0",
  "description": "Click a button, post to URL",
  "homepage_url": "https://github.com/coreyja/whack-a-post",
  "icons": {
    "48": "icons/mole.svg"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/mole.svg",
    "default_title": "Beastify",
    "default_popup": "popup/whack.html"
  },
  "options_ui": {
    "page": "settings/options.html",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "whack-a-mole@coreyja.com"
    }
  }
}