Examine source code of DP-Instagram

{
  "manifest_version": 2,
  "name": "DP-Instagram",
  "version": "1.5.0",
  "description": "Enables instagram mobile interface with the ability to upload content from your personal computer.",
  "applications": {
    "gecko": {
      "id": "dp-instagram@dp-develop.com",
      "strict_min_version": "48.0"
    }
  },
  "icons": {
    "24": "icons/instagram-24.png",
    "48": "icons/instagram-48.png",
    "96": "icons/instagram-128.png"
  },
  "background": {
    "page": "background/bg-page.html"
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "DP-Instagram Enabled",
    "theme_icons": [
      {
        "light": "icons/instagram-enabled.svg",
        "dark": "icons/instagram-enabled.svg",
        "size": 32
      }
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.instagram.com/*",
        "*://www.instagram.com/",
        "*://instagram.com/*",
        "*://instagram.com/"
      ],
      "js": [
        "content_scripts/cs-settings.js",
        "content_scripts/cs-inject.js",
        "content_scripts/cs-enhance.js"
      ]
    }
  ],
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://www.instagram.com/*",
    "*://www.instagram.com/",
    "*://instagram.com/*",
    "*://instagram.com/",
    "storage"
  ]
}