Examine source code of CSS Color Code Viewer

{
  "manifest_version": 2,
  "name": "CSS Color Code Viewer",
  "version": "1.0",
  "description": "Shows all CSS color codes and RGB values ​​on the current web page.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{55968812-d8ec-407e-87ab-f7e6e34d333f}"
    }
  }
}