Examine source code of Clip to GIF

{
  "manifest_version": 2,
  "name": "Clip to GIF",
  "version": "3.4.6",
  "description": "Pick length, frame rate, width and colour count, then save the clip as a GIF.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{74e2ab9b-9040-42e4-ba2a-c03ab92374d8}",
      "strict_min_version": "101.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "32": "graphics/icon32.png",
    "48": "graphics/icon48.png",
    "64": "graphics/icon64.png",
    "96": "graphics/icon96.png",
    "128": "graphics/icon128.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_popup": "core/popup.html",
    "default_title": "Clip to GIF",
    "default_icon": {
      "32": "graphics/icon32.png",
      "48": "graphics/icon48.png",
      "64": "graphics/icon64.png",
      "96": "graphics/icon96.png",
      "128": "graphics/icon128.png"
    }
  },
  "web_accessible_resources": [
    "core/core.js",
    "core/content.js"
  ]
}