Examine source code of Private Bookmarks

{
  "manifest_version": 2,
  "name": "__MSG_extension_name__",
  "author": "Raoul Harel",
  "version": "0.1.19a",
  "description": "__MSG_extension_description__",
  "homepage_url": "https://github.com/rharel/webext-private-bookmarks",
  "applications": {
    "gecko": {
      "id": "private-bookmarks@rharel",
      "strict_min_version": "55.0"
    }
  },
  "background": {
    "scripts": [
      "libraries/require.js",
      "scripts/background/main.js"
    ]
  },
  "browser_action": {
    "browser_style": false,
    "default_area": "navbar",
    "default_icon": {
      "16": "icons/main/locked-bookmarks.svg",
      "32": "icons/main/locked-bookmarks.svg",
      "48": "icons/main/locked-bookmarks.svg",
      "64": "icons/main/locked-bookmarks.svg",
      "96": "icons/main/locked-bookmarks.svg",
      "128": "icons/main/locked-bookmarks.svg",
      "256": "icons/main/locked-bookmarks.svg"
    },
    "default_popup": "popup_ui/page.html",
    "default_title": "__MSG_extension_name__"
  },
  "commands": {
    "_execute_page_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+8"
      },
      "description": "__MSG_shortcut_bookmark_page_title__"
    },
    "lock": {
      "suggested_key": {
        "default": "Ctrl+Shift+L"
      },
      "description": "__MSG_shortcut_lock_bookmarks_title__"
    },
    "open-menu": {
      "suggested_key": {
        "default": "Alt+Shift+8"
      },
      "description": "__MSG_shortcut_open_menu_title__"
    },
    "bookmark-all": {
      "suggested_key": {
        "default": "Ctrl+Shift+F8"
      },
      "description": "__MSG_shortcut_bookmark_all_title__"
    }
  },
  "default_locale": "en",
  "icons": {
    "16": "icons/main/private-bookmarks.svg",
    "32": "icons/main/private-bookmarks.svg",
    "48": "icons/main/private-bookmarks.svg",
    "64": "icons/main/private-bookmarks.svg",
    "96": "icons/main/private-bookmarks.svg",
    "128": "icons/main/private-bookmarks.svg",
    "256": "icons/main/private-bookmarks.svg"
  },
  "options_ui": {
    "browser_style": false,
    "page": "options_ui/page.html"
  },
  "page_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/main/unlocked-bookmarks.svg",
      "32": "icons/main/unlocked-bookmarks.svg",
      "48": "icons/main/unlocked-bookmarks.svg",
      "64": "icons/main/unlocked-bookmarks.svg",
      "96": "icons/main/unlocked-bookmarks.svg",
      "128": "icons/main/unlocked-bookmarks.svg",
      "256": "icons/main/unlocked-bookmarks.svg"
    },
    "default_title": "__MSG_page_action_title__"
  },
  "permissions": [
    "bookmarks",
    "storage",
    "tabs"
  ],
  "optional_permissions": [
    "idle"
  ]
}