Examine source code of Better /kbin

{
  "name": "Better kbin",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "author": "Michał Stankiewicz",
  "version": "2.2.1.0",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "betterkbin@mstankiewi.cz"
    }
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png",
    "512": "icon512.png"
  },
  "background": {
    "page": "background-page.html"
  },
  "permissions": [
    "contextMenus",
    "storage",
    "tabs"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "host_permissions": [
    "<all_urls>",
    "*://*/*"
  ],
  "action": {
    "default_popup": "popup.html"
  }
}