Examine source code of Search Word Tabs

{
  "description": "Search any word across all your open tabs",
  "manifest_version": 2,
  "name": "Search Tabs",
  "permissions": [
    "find",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Search Tabs",
    "default_icon": {
      "64": "icons/logo_64.png"
    }
  },
  "version": "1.0",
  "applications": {
    "gecko": {
      "strict_min_version": "57.0a1"
    }
  }
}