Examine source code of Auto Meme Captioner

{
  "manifest_version": 2,
  "name": "Auto Meme Captioner",
  "version": "1.0",
  "description": "Hover over an image to see a funny meme-style caption.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "styles.css"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Auto Meme Captioner"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a7b2079-9814-47f5-aa5b-fb945198b116}"
    }
  }
}