manifest.json

{
  "manifest_version": 2,

  "name": "DareAngel",
  "description": "This extension provides more accessibility on images of a web page by using Microsoft Cognitive Services Computer Vision API to analyze it for you",
  "version": "1.0",
  "author": "David Rousset",

  "icons": {
    "48": "icon38.png"
  }, 
  "browser_action": {
        "default_title": "Dare Angel",
        "default_icon": {
          "19":"icon20.png",
          "20":"icon20.png",
          "38":"icon38.png"
        },  
    "default_popup": "dashboard.html"
  },
    "content_scripts": [
    {
      "matches": ["<all_urls>"],
      "js": ["dareangel.client.js"],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "activeTab"
  ]
}