Examine source code of ShowMeOdds

{
  "manifest_version": 2,
  "name": "ShowMeOdds",
  "version": "1.0",
  "description": "A Mozilla extension that works with the conversion between decimal and American odds formats.",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Click to inject script"
  },
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "show_me_odds@gmail.com"
    }
  },
  "icons": {
    "48": "icon.png"
  }
}