Examine source code of Tempo - Media Hub

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "version": "2.8.2",
  "description": "__MSG_extDesc__",
  "default_locale": "en",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "__MSG_extName__",
    "default_popup": "popup/hub.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "mediasession.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true,
      "world": "MAIN"
    }
  ],
  "commands": {
    "tempo-toggle": {
      "suggested_key": {
        "default": "Ctrl+Alt+Space"
      },
      "description": "__MSG_cmdToggle__"
    },
    "tempo-pause-all": {
      "suggested_key": {
        "default": "Ctrl+Alt+Period"
      },
      "description": "__MSG_cmdPauseAll__"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tempo-media-hub@local.ext",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}