Examine source code of Thematic

{
  "manifest_version": 2,
  "name": "Thematic",
  "version": "1.3",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "icons": {
    "48": "assets/logo.svg",
    "96": "assets/logo.svg"
  },
  "permissions": [
    "<all_urls>",
    "webNavigation",
    "activeTab",
    "tabs",
    "contextMenus",
    "storage"
  ],
  "background": {
    "scripts": [
      "src/util.js",
      "vendor/tinycolor.js",
      "src/background_scripts/transform.js",
      "src/background_scripts/thematic.js"
    ]
  },
  "browser_action": {
    "default_icon": "./assets/logo.svg",
    "default_title": "Thematic",
    "default_popup": "./pages/popup.html"
  }
}