Examine source code of BlueBlocker

{
  "description": "Blocks all comments of twitter users that subscribed to twitter blue.",
  "manifest_version": 2,
  "name": "BlueBlocker",
  "version": "1.1",
  "homepage_url": "https://36it.de/",
  "icons": {
    "48": "icons/256logo.png"
  },
  "browser_action": {
    "default_icon": "icons/256logo.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*"
      ],
      "js": [
        "blueblocker.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6667fe96-6f91-4c32-affa-f40c85b38c71}"
    }
  }
}