Examine source code of Alt Tag Viewer

{
  "manifest_version": 2,
  "name": "Alt Tag Viewer",
  "version": "0.1",
  "description": "Displays image alt tag and name on hover of image, enhancing web accessibility and SEO effectiveness.",
  "icons": {
    "48": "icons/alt-icon-48.png"
  },
  "permissions": [
    "activeTab",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/alt-icon-48.png",
    "default_title": "Toggle Alt Tags"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{dc4bce46-c2d3-4c8a-b7ae-17d74e4ba722}"
    }
  }
}