Examine source code of Abookmark

{
  "version": "0.29.3",
  "short_name": "Abookmark",
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "manifest_version": 2,
  "homepage_url": "https://github.com/pfcao/abookmark",
  "default_locale": "en",
  "icons": {
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_action": {
    "default_icon": "icon-48.png",
    "default_popup": "popup.html"
  },
  "commands": {
    "openHomePage": {
      "description": "__MSG_openHomePage__",
      "suggested_key": {
        "default": "Ctrl+E"
      }
    },
    "toggleBmInPage": {
      "description": "__MSG_toggleBmInPage__"
    },
    "toggleNavInPage": {
      "description": "__MSG_toggleNavInPage__",
      "suggested_key": {
        "default": "Ctrl+Q"
      }
    },
    "openNavPage": {
      "description": "__MSG_openNavPage__"
    },
    "togglePickMode": {
      "description": "__MSG_togglePickMode__"
    },
    "addNoteToPage": {
      "description": "__MSG_addNoteToPage__"
    },
    "saveCurrentTab": {
      "description": "__MSG_saveCurrentTab__"
    },
    "storeSelectedTabs": {
      "suggested_key": {
        "default": "Ctrl+S"
      },
      "description": "__MSG_storeSelectedTabs__"
    },
    "storeCurrentGroup": {
      "description": "__MSG_storeCurrentGroup__"
    },
    "storeAllTabs": {
      "description": "__MSG_storeAllTabs__"
    },
    "storeOtherTabs": {
      "description": "__MSG_storeOtherTabs__"
    },
    "storeLeftTabs": {
      "description": "__MSG_storeLeftTabs__"
    },
    "storeRightTabs": {
      "description": "__MSG_storeRightTabs__"
    },
    "sailFocus": {
      "description": "sail.reveal first tab"
    },
    "sailFold": {
      "description": "sail.fold"
    },
    "sailUpward": {
      "description": "sail.go upward"
    },
    "sailRefresh": {
      "description": "sail.refresh & repaginate"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "bookmarks",
    "tabs",
    "activeTab",
    "storage",
    "contextMenus",
    "notifications",
    "chrome://favicon/",
    "downloads",
    "unlimitedStorage"
  ],
  "optional_permissions": [
    "<all_urls>",
    "https://www.bing.com/"
  ],
  "web_accessible_resources": [
    "index.html",
    "app.html",
    "nav.html",
    "bookmarks.html"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'; img-src 'self' chrome://favicon https://* http://*;",
  "browser_specific_settings": {
    "gecko": {
      "id": "{38ebac04-3f9f-4049-a437-3e822f26cc20}"
    }
  }
}