Examine source code of Changement D'images

{
  "manifest_version": 2,
  "name": "Replace Images",
  "version": "1.0",
  "description": "Replaces all images on webpages with the OpenAI logo.",
  "permissions": [
    "activeTab",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon.png",
      "48": "icon.png",
      "128": "icon.png"
    }
  },
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{49880500-cd7f-4aad-a50e-0cca2cd4afbb}"
    }
  }
}