Examine source code of Reading List

{
  "applications": {
    "gecko": {
      "id": "readinglist@waldemar.b",
      "strict_min_version": "60.0a1"
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>",
    "contextMenus",
    "notifications",
    "bookmarks"
  ],
  "sidebar_action": {
    "browser_style": false,
    "default_title": "__MSG_extensionName__",
    "default_panel": "sidebar.html",
    "default_icon": "icons/icon.svg"
  },
  "browser_action": {
    "default_title": "__MSG_extensionAction__",
    "default_icon": "icons/btn.svg#dark",
    "theme_icons": [
      {
        "light": "icons/btn.svg#light",
        "dark": "icons/btn.svg#dark",
        "size": 19
      }
    ]
  },
  "page_action": {
    "default_icon": {
      "19": "icons/btn.svg#dark"
    }
  },
  "background": {
    "page": "bg.html"
  },
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Q",
        "mac": "Alt+R",
        "linux": "Alt+R"
      }
    }
  },
  "description": "__MSG_extensionDescription__",
  "manifest_version": 2,
  "default_locale": "en",
  "name": "__MSG_extensionName__",
  "version": "1.5.5",
  "icons": {
    "48": "icons/icon.svg"
  },
  "options_ui": {
    "browser_style": false,
    "page": "/index.html#options",
    "open_in_tab": true
  }
}