Examine source code of Copy Image Name

{
  "manifest_version": 3,
  "name": "Copy Image Name",
  "version": "1.0",
  "description": "Copy image name at right click context menu.",
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "icons": {
    "32": "icons/icon.svg",
    "64": "icons/icon.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "copy-image-name@olibrauma.com"
    }
  }
}