Examine source code of based64

{
  "manifest_version": 2,
  "title": "based64",
  "name": "based64",
  "description": "Encode and decode Base64 text",
  "version": "1.0",
  "author": "victor.devtan@gmail.com",
  "icons": {
    "96": "icon.png"
  },
  "browser_action": {
    "default_title": "based64",
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  }
}