Examine source code of Meme Generator

{
  "manifest_version": 2,
  "name": "Meme Generator",
  "version": "1.0",
  "description": "Right-click any image to create a meme with top/bottom text.",
  "permissions": [
    "contextMenus",
    "activeTab",
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Meme Generator"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{447e27c5-5c3c-450b-a7a5-89acf3b3976b}"
    }
  }
}