manifest.json

{
    "name": "Gratitude Forest",
    "description": "Grateful message grows into a tree",
    "version": "0.0.0.1",
    "permissions": [
        "storage",
        "unlimitedStorage"
    ],
    "background": {
      "scripts": [
        "js/libraries/math2.js",
        "js/libraries/stats.js",
        "js/libraries/three.min.js",
        "js/libraries/geometryHelpers.js",
        "js/libraries/tweenmax.js",
        "js/libraries/scenecolors.js",
        "js/libraries/orbitcontrols.js",
        "js/libraries/custommesh.js",
        "js/libraries/dat.gui.min.js",
        "js/foliage.js",
        "js/tree.js",
        "js/particle.js",
        "js/scene.js",
        "js/extension.js"
      ],
      "persistent": false
    },
    "optional_permissions": ["notifications"],
    "chrome_url_overrides": {
        "newtab": "index.html"
    },
    "manifest_version": 2,
    "content_security_policy": "script-src 'self'; object-src 'self'"
}