Examine source code of Shortalize

{
  "name": "Shortalize",
  "description": "Shortcuts made magical",
  "version": "1.0.12",
  "manifest_version": 2,
  "icons": {
    "16": "./assets/images/icon-16x16.png",
    "32": "./assets/images/icon-32x32.png",
    "48": "./assets/images/icon-48x48.png",
    "128": "./assets/images/icon-128x128.png"
  },
  "background": {
    "scripts": [
      "./src/background.js"
    ],
    "persistent": true
  },
  "web_accessible_resources": [
    "assets/*",
    "src/script.js",
    "src/options.html"
  ],
  "browser_action": {
    "default_popup": "./src/popup.html",
    "default_icon": {
      "16": "./assets/images/icon-16x16.png",
      "32": "./assets/images/icon-32x32.png",
      "48": "./assets/images/icon-48x48.png",
      "128": "./assets/images/icon-128x128.png"
    }
  },
  "options_ui": {
    "page": "./src/options.html"
  },
  "permissions": [
    "http://*/*",
    "https://*/*",
    "storage",
    "scripting",
    "webNavigation"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{24a58112-adc1-4974-9312-f0283b6d7cb0}"
    }
  }
}