InstaMinus - Nonreciprocal Instagram follower

Getting a list of people who are not subscribed in response to you.
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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "version": "1.7.6",
  "default_locale": "en",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.instagram.com/*"
      ],
      "run_at": "document_idle",
      "all_frames": false,
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "inc/main.js",
    "inc/main.css",
    "images/coffee.svg"
  ],
  "icons": {
    "16": "images/icon.png",
    "48": "images/icon.png",
    "128": "images/icon.png"
  },
  "permissions": [
    "https://www.instagram.com/*"
  ],
  "browser_action": {
    "default_icon": "images/icon.png"
  }
}