Examine source code of Simple Data Layer Viewer

{
  "manifest_version": 2,
  "name": "Simple Data Layer Viewer",
  "description": "Visualize data layers on any website.",
  "version": "3.3.2",
  "icons": {
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "declarativeNetRequest",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "fetch-layers.js",
    "inject-code.js",
    "log-layers.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "simple-data-layer-viewer@datapip.de"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Simple Data Layer Viewer",
    "default_popup": "popup.html"
  },
  "devtools_page": "devtools.html",
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}