Examine source code of Altmail ~Be Awesome

{
  "applications": {
    "gecko": {
      "id": "{5fccd171-598e-4edd-be54-7baf57a100f6}"
    }
  },
  "name": "Altmail ~A smart inbox without a reply button",
  "version": "1.0.2resigned1",
  "manifest_version": 2,
  "description": "A smart inbox for all your favorite newsletter, deal, digest and update emails. Spend more time acquiring knowledge.",
  "homepage_url": "https://altmail.in",
  "short_name": "Altmail",
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "scripts/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "19": "images/icon19.png",
      "38": "images/icon38.png"
    }
  },
  "permissions": [
    "contextMenus",
    "cookies",
    "https://*/*",
    "http://*/*",
    "tabs",
    "<all_urls>",
    "storage",
    "alarms"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [
        "styles/inject.css"
      ],
      "js": [
        "bower_components/jquery/jquery.js",
        "bower_components/typed.js/js/typed.js",
        "scripts/inject.js"
      ],
      "run_at": "document_end",
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    "images/*.png",
    "images/*.jpg",
    "images/*.jpeg"
  ]
}