Examine source code of Bookmarker by start.me

{
  "manifest_version": 2,
  "name": "start.me Bookmarker",
  "short_name": "__MSG_APP_SHORT_NAME__",
  "description": "__MSG_APP_DESCRIPTION__",
  "version": "3.2.2",
  "author": "start.me",
  "homepage_url": "https://start.me",
  "icons": {
    "16": "icons/icon16.png",
    "19": "icons/icon19.png",
    "32": "icons/icon32.png",
    "38": "icons/icon38.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "omnibox": {
    "keyword": "me"
  },
  "default_locale": "en",
  "incognito": "spanning",
  "browser_specific_settings": {
    "gecko": {
      "id": "{a52beb03-e4b2-42d3-ba9b-35bec74bb475}",
      "strict_min_version": "58.0"
    }
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true,
    "open_in_tab": false
  },
  "browser_action": {
    "default_icon": {
      "19": "icons/icon19.png",
      "38": "icons/icon38.png"
    },
    "default_title": "__MSG_ADD_TO_STARTME__",
    "default_popup": "popup.html",
    "browser_style": false
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Alt+B",
        "mac": "Command+Alt+B"
      },
      "description": "__MSG_ADD_TO_STARTME__"
    },
    "open_startme_homepage": {
      "suggested_key": {
        "default": "Ctrl+Alt+H",
        "mac": "Command+Alt+H"
      },
      "description": "__MSG_OPEN_STARTME_HOMEPAGE__"
    }
  },
  "minimum_chrome_version": "51",
  "permissions": [
    "storage",
    "activeTab",
    "https://start.me/",
    "contextMenus",
    "bookmarks"
  ],
  "web_accessible_resources": [
    "popup.html",
    "welcome.html",
    "import.html",
    "options.html"
  ],
  "content_security_policy": "script-src 'self' ; object-src 'self'"
}