Examine source code of Outline Colorizer

{
  "manifest_version": 2,
  "name": "Outline Colorizer",
  "version": "1.1resigned1",
  "description": "Gives colorized outlines.",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "page_action": {
    "default_icon": "icon16.png",
    "default_popup": "popup.html",
    "default_title": "Output Colorizer."
  },
  "background": {
    "scripts": [
      "eventPage.js"
    ],
    "persistent": false,
    "permissions": [
      "tabs",
      "<all_urls>"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js",
        "jquery-3.3.1.min.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e7a5149f-330d-4c82-81de-c1b0e805dd5f}"
    }
  }
}