Examine source code of Minimalist Meme Maker

{
  "manifest_version": 2,
  "name": "Minimalist Meme Maker",
  "version": "1.0",
  "description": "Quickly add captions to images on the web and save as memes without Photoshop.",
  "permissions": [
    "activeTab",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c213faf0-9fa3-4dab-b0bc-8f812da02450}"
    }
  }
}