Examine source code of Remark

{
  "manifest_version": 2,
  "name": "Remark",
  "description": "Turn any piece of writing into a tweet. Use machine learning to turn long text into one short sentence",
  "version": "1.5",
  "author": "Remark Apps",
  "icons": {
    "48": "logo-48.png",
    "96": "logo-96.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "js": [
        "./jquery.min.js",
        "./scripts.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "logo.svg",
    "default_title": "Remark",
    "default_popup": "popup.html"
  }
}