Examine source code of Image Clipper

{
  "manifest_version": 2,
  "name": "Image Clipper - Middle Click Save",
  "version": "1.0.0",
  "description": "Middle-click (scroll wheel click) any image on the web to save it locally, then drag saved images into any chat, form, or app.",
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_icon": "icon.svg",
    "default_title": "Saved Images (click to view)",
    "default_popup": "gallery.html"
  },
  "sidebar_action": {
    "default_icon": "icon.svg",
    "default_title": "Saved Images",
    "default_panel": "gallery.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "image-clipper@local.extension",
      "strict_min_version": "78.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}