Examine source code of Copy Video Frame

{
  "author": "igorlogius",
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{b578d554-3b0b-4f6b-8bbe-5decdd5915ae}"
    }
  },
  "homepage_url": "https://github.com/igorlogius/webextensions/tree/main/sources/copy-video-frame",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "description": "Adds a context menu entry that allows to capture a still frame image from a html video element",
  "icons": {
    "512": "icon.png"
  },
  "manifest_version": 2,
  "name": "Copy Video Frame",
  "permissions": [
    "menus",
    "activeTab"
  ],
  "optional_permissions": [
    "clipboardWrite"
  ],
  "version": "1.1.17"
}