Examine source code of Notan

{
  "manifest_version": 2,
  "name": "Notan",
  "description": "The browser extension for seamless, page-specific note-taking.",
  "permissions": [
    "tabs",
    "cookies",
    "http://*/*",
    "https://*/*"
  ],
  "icons": {
    "128": "icon-128.png"
  },
  "content_scripts": [],
  "web_accessible_resources": [
    "assets/js/*.js",
    "assets/css/*.css",
    "icon-128.png",
    "icon-34.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@notan.ax"
    }
  },
  "browser_action": {
    "default_popup": "src/core/popup/index.html",
    "default_icon": "icon-34.png"
  },
  "version": "1.4.0"
}