Examine source code of ContainMarks

{
  "name": "ContainMarks",
  "description": "Natively and easily edit and open bookmarks in multi-account containers.",
  "version": "1.2.1",
  "manifest_version": 2,
  "author": "Mikenrafter",
  "homepage_url": "https://gitlab.com/mikenrafter/ContainMarks",
  "permissions": [
    "tabs",
    "menus",
    "contextMenus",
    "bookmarks",
    "contextualIdentities",
    "cookies",
    "storage",
    "unlimitedStorage",
    "notifications",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "management",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "preferences/options.html",
    "open_in_tab": false,
    "browser_style": true
  },
  "icons": {
    "19": "icons/icon.svg",
    "32": "icons/icon.svg",
    "48": "icons/icon.svg",
    "96": "icons/icon.svg",
    "128": "icons/icon.svg"
  },
  "page_action": {
    "default_icon": {
      "19": "icons/icon-mini.svg",
      "32": "icons/icon-mini.svg",
      "48": "icons/icon-mini.svg",
      "96": "icons/icon-mini.svg",
      "128": "icons/icon-mini.svg"
    },
    "default_title": "Bookmark this URL inside this container."
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "cont@bmarks",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}