Examine source code of Save the Internet

{
  "name": "Save the Internet",
  "description": "A universal \"save as\" for your Firefox browser.",
  "version": "0.13.3",
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "dissident_firefox_extension@dissident.ai",
      "strict_min_version": "48.0"
    }
  },
  "icons": {
    "16": "assets/images/desktop-logo-16.png",
    "48": "assets/images/desktop-logo-48.png",
    "128": "assets/images/desktop-logo.png"
  },
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": {
      "19": "assets/images/desktop-logo-19.png",
      "38": "assets/images/desktop-logo-38.png"
    },
    "default_title": "Polite",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": false,
    "open_in_tab": false
  },
  "permissions": [
    "tabs",
    "contextMenus",
    "http://*/*",
    "https://*/*",
    "storage",
    "notifications"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "config/main-config.js",
        "vapi.js",
        "page/vapi-client-firefox.js",
        "page/web-content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "assets/images/spinner.gif",
    "assets/images/button-x.png",
    "spinnerstyle.css"
  ]
}