Examine source code of Shortcut Gallery BS

{
  "manifest_version": 2,
  "name": "Shortcut Gallery BS",
  "version": "1.55",
  "description": "A simple shortcut gallery for your favorite links.",
  "permissions": [
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "chrome_url_overrides": {
    "newtab": "popup.html"
  },
  "options_page": "preferences.html",
  "web_accessible_resources": [
    "*"
  ],
  "applications": {
    "gecko": {
      "id": "shortcut-gallery@example.com",
      "strict_min_version": "91.0"
    }
  }
}