Examine source code of Link Hover Preview Shapes

{
  "manifest_version": 2,
  "name": "Link Hover Preview Shapes",
  "version": "1.0",
  "description": "Show a playful shape (star, bubble, emoji) next to links when you hover them.",
  "permissions": [
    "<all_urls>",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_title": "Link Hover Preview Shapes",
    "default_popup": "popup.html",
    "default_icon": "icons/icon48.png"
  },
  "icons": {
    "48": "icons/icon48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{828e548f-6f32-44d8-b189-48642fa7d30f}"
    }
  }
}