Examine source code of Spam Tweets Compressor

{
  "manifest_version": 2,
  "name": "Spam Tweets Compressor",
  "short_name": "ST Compressor",
  "version": "2.0.13.9",
  "description": "__MSG_manifest_description__",
  "icons": {
    "16": "image/icon16.png",
    "48": "image/icon48.png",
    "128": "image/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://twitter.com/*",
        "https://mobile.twitter.com/*"
      ],
      "js": [
        "dist/common/webextension_polyfill/browser-polyfill.min.js",
        "dist/main.js"
      ],
      "css": [
        "dist/main.css"
      ]
    }
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "image/icon16.png",
      "48": "image/icon48.png",
      "128": "image/icon128.png"
    },
    "default_popup": "dist/browser_action/index.html",
    "default_title": "Spam Tweets Compressor"
  },
  "default_locale": "en",
  "permissions": [
    "downloads",
    "storage",
    "https://cdn.statically.io/gh/Robot-Inventor/stc-filter/*/*"
  ],
  "applications": {
    "gecko": {
      "id": "{feb13580-3a7d-4151-923b-2b39c1104fe4}"
    }
  }
}