manifest_example.json5

{
  // Required
  "manifest_version": 2, // manifest version number (always 2)
  "name": "My Extension",
  "version": "1.0.0",

  // Recommended
  "default_locale": "en",
  "description": "A plain text description",
  "icons": { "16": "icon16.png",
             "48": "icon48.png",
             "128": "icon128.png"
            }, // These icons are used in the Chrome app store, and in any tabs your extension creates

  // Pick one (or none)
  "browser_action": {...},
  "page_action": {...},

  // Optional
  "author": ...,
  "background": {
      "scripts": [ "background.js" ],
    // Recommended
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": ["http://www.google.com/*"],
      "css": ["mystyles.css"],
      "js": ["jquery.js", "myscript.js"]
    }
  ]
}