Examine source code of Screenshot Highlighter

{
  "manifest_version": 2,
  "name": "Screenshot Highlighter",
  "version": "1.0",
  "description": "Highlight text on screenshots and save the image.",
  "permissions": [
    "activeTab",
    "downloads"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5f83ddf2-a06b-4e98-ae55-960a4700df86}"
    }
  }
}