Examine source code of Bookmark using Tags

{
  "manifest_version": 2,
  "name": "Bookmarker",
  "version": "1.0",
  "description": "Easily bookmark websites with tags and descriptions, and sync with Firefox Sync.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "Bookmarker@test.com",
      "strict_min_version": "57.0"
    }
  },
  "permissions": [
    "tabs",
    "bookmarks",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_popup": "popup.html"
  }
}