manifest.json

    {
      "manifest_version": 2,

      "name": "Empathy",
      "version": "0.1",

      "description": "Simulate accessibility issues for websites.",

      "browser_action": {
        "default_icon": "empathy19.png",
        "default_title": "Empathy!"
      },

      "permissions": [
        "activeTab",
        "<all_urls>",
        "contextMenus",
        "desktopCapture",
        "tabCapture",
        "tts" // Text-to-speech
      ],

      "background":   {
        "scripts": [
          "boot.js"
        ],
        "persistent": false
      },

      "content_scripts": [
        {
          "matches": ["<all_urls>"],
          "js": [
            "src/helpers.js",
            "src/colorblindness.js",
            "lib/colorvision.js",
            "lib/html2canvas.js"
          ]
        }
      ],

      "options_ui": {
        "page": "options.html",
        "chrome_style": true
      }
    }