Examine source code of Speed & Loop

{
  "name": "Speed & Loop",
  "short_name": "Speed & Loop",
  "version": "2.3.15",
  "manifest_version": 2,
  "description": "Control playback speed and loop sections of HTML5 video with shortcuts",
  "browser_specific_settings": {
    "gecko": {
      "id": "{a3c1e7f2-9b4d-4a6e-8f15-d2c7b9e0a134}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "extension/icons/icon16.png",
    "32": "extension/icons/icon32.png",
    "48": "extension/icons/icon48.png",
    "64": "extension/icons/icon64.png",
    "128": "extension/icons/icon128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "webNavigation",
    "<all_urls>"
  ],
  "options_ui": {
    "page": "extension/options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_icon": {
      "19": "extension/icons/icon19.png",
      "38": "extension/icons/icon38.png",
      "48": "extension/icons/icon48.png"
    },
    "theme_icons": [
      {
        "light": "extension/icons/icon19_dark.png",
        "dark": "extension/icons/icon19.png",
        "size": 19
      },
      {
        "light": "extension/icons/icon38_dark.png",
        "dark": "extension/icons/icon38.png",
        "size": 38
      },
      {
        "light": "extension/icons/icon48_dark.png",
        "dark": "extension/icons/icon48.png",
        "size": 48
      }
    ]
  },
  "background": {
    "scripts": [
      "extension/background/toolbar-button.js",
      "extension/background/content-script-injection-list.js",
      "extension/background/active-tab-injection-policy.js",
      "extension/background/content-script-injection-runner.js",
      "extension/background/loader.js"
    ]
  },
  "web_accessible_resources": [
    "extension/page-world/media-hook.js",
    "extension/styles/content.css",
    "extension/styles/overlay-shadow.css"
  ]
}