Examine source code of Firemarks

{
  "manifest_version": 2,
  "name": "Firemarks",
  "description": "Search through your bookmarks with a popup from your address bar",
  "version": "1.0.3",
  "options_ui": {
    "page": "options.html"
  },
  "short_name": "Filterable bookmarks manager",
  "commands": {
    "_execute_browser_action": {
      "description": "Searchable Bookmarks Manager"
    }
  },
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_action": {
    "default_icon": {
      "19": "images/icon19.png",
      "38": "images/icon38.png"
    },
    "default_popup": "popup.html"
  },
  "applications": {
    "gecko": {
      "id": "@firemarks",
      "strict_min_version": "55.0"
    }
  },
  "background": {
    "page": "popup.html"
  },
  "permissions": [
    "activeTab",
    "bookmarks",
    "storage",
    "contextMenus"
  ]
}