Examine source code of Easy Bookmark

{
  "manifest_version": 2,
  "name": "Easy Bookmarks",
  "version": "1.5",
  "description": "Display all bookmarks as icons on new tab page",
  "permissions": [
    "bookmarks",
    "storage",
    "topSites",
    "history"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "chrome_settings_overrides": {
    "homepage": "newtab.html"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "easy-bookmarks@example.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}