Examine source code of Bookmark Manager Plus

{
  "manifest_version": 2,
  "name": "Bookmark Manager Plus",
  "version": "1.0",
  "description": "AMO-safe bookmark manager: view, add, and delete bookmarks.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Bookmark Manager Plus",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "bookmark-manager-plus@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "bookmarks",
    "activeTab"
  ]
}