Examine source code of DDSOS

{
  "background": {
    "scripts": [
      "ddsos.js",
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": "icons/ddsos-32-active.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "ddsos.js",
        "content.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "description": "Adds easy edit/search (datalist) functionality for every Drop-Down (Select/Option) element on the web-page.",
  "homepage_url": "https://github.com/jj999/DDSOS",
  "icons": {
    "32": "icons/ddsos-32-active.png",
    "64": "icons/ddsos-64-active.png",
    "128": "icons/ddsos-128-active.png"
  },
  "manifest_version": 2,
  "name": "Drop-down (Select/Option) Simplifier - DDSOS",
  "options_ui": {
    "chrome_style": true,
    "page": "options.html"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "version": "1.0.0",
  "applications": {
    "gecko": {
      "id": "DropDownSelectOptionSimplifier@gmail.com"
    }
  }
}