Examine source code of Material Freebox OS

{
  "manifest_version": 2,
  "name": "Material Freebox OS",
  "description": "Redesign de l'interface de Freebox OS",
  "version": "2.6.1resigned1",
  "icons": {
    "16": "data/img/icon-16x16.png",
    "32": "data/img/icon-32x32.png",
    "48": "data/img/icon-48x48.png",
    "64": "data/img/icon-64x64.png",
    "90": "data/img/icon-90x90.png",
    "128": "data/img/icon-128x128.png",
    "256": "data/img/icon-256x256.png"
  },
  "author": "Quentin S.",
  "applications": {
    "gecko": {
      "id": "material-freebox-os@s-quent.in",
      "strict_min_version": "48.0"
    }
  },
  "browser_action": {
    "default_popup": "data/browser-action/index.html",
    "default_icon": {
      "18": "data/img/icon-18x18.png",
      "19": "data/img/icon-19x19.png",
      "32": "data/img/icon-32x32.png",
      "36": "data/img/icon-36x36.png",
      "38": "data/img/icon-38x38.png",
      "64": "data/img/icon-64x64.png"
    }
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://mafreebox.freebox.fr/*",
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "data/js/material-freebox-os.js",
        "data/js/injector.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "data/js/material-freebox-os.js",
    "data/js/content-script.js",
    "data/img/mdi-check.png",
    "data/img/wallpaper*.jpg",
    "data/css/style.css",
    "data/css/fonts/roboto.css",
    "data/css/fonts/materialdesignicons.css"
  ]
}