Examine source code of Copy This Block

{
  "manifest_version": 2,
  "name": "__MSG_Copy_This_Block__",
  "version": "0.9.3resigned1",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "https://github.com/uenoB/copy_this_block",
  "default_locale": "en",
  "icons": {
    "48": "/images/icon.svg"
  },
  "background": {
    "scripts": [
      "/background.js"
    ]
  },
  "commands": {
    "copy_this_block": {
      "suggested_key": {
        "default": "Alt+Shift+C"
      },
      "description": "__MSG_Copy_This_Block__"
    }
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "clipboardWrite"
  ],
  "optional_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{76dd6929-b399-4c70-bcaa-19fe382feb1a}"
    }
  }
}