Examine source code of Fragment Extension

{
  "icons": {
    "16": "icon16.plasmo.e7bcd3ac.png",
    "32": "icon32.plasmo.ce39377b.png",
    "48": "icon48.plasmo.3c17e113.png",
    "64": "icon64.plasmo.df317abe.png",
    "128": "icon128.plasmo.6a4310c5.png"
  },
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "16": "icon16.plasmo.e7bcd3ac.png",
      "32": "icon32.plasmo.ce39377b.png",
      "48": "icon48.plasmo.3c17e113.png",
      "64": "icon64.plasmo.df317abe.png",
      "128": "icon128.plasmo.6a4310c5.png"
    },
    "default_popup": "popup.html"
  },
  "version": "0.20.12",
  "author": "Fragment",
  "name": "Fragment",
  "description": "Go to your next task with one click. Track, measure, and optimize your performance.",
  "background": {
    "scripts": [
      "static/background/index.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs",
    "idle",
    "https://*/*",
    "http://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "js": [
        "contents.75c27d66.js"
      ],
      "run_at": "document_start",
      "css": []
    }
  ],
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAs6Z4cAFJ7jKzBeY6OF+TiehWSU7Zso+mFNGi7yIO/p0vM6Y5aNl4QBASwbWBQgNQZR2BcoV1Ah9hn9p+Zsq1fUzK+x1UOTM5b6cuAI2OaN3QdRBQEjGviHhUzZTR3k9xdnWJIwQsrvOLZLugMNoW9T9HC4mVGWC9GA9jwTgAZItdg/j12ZL6XOiIt2FRzVHKwO9l0Q0x0KBSA6x3Ux8ArERJhmT1UCCbGvgGdxvn6Y+CrvpHubDGBr2EVtUvANAejl0oDhAvm0dCxSgya4v45fxrwlgQYuS+FmN4MZz1FwWsAwWeb1LGTS26nd9E6o3b3p5PAlxw7/nNsNe8lb8WKwIDAQAB",
  "externally_connectable": {
    "matches": [
      "https://*.onfragment.com/*",
      "*://localhost/*"
    ]
  },
  "web_accessible_resources": [
    "assets/icon.png",
    "assets/icon-white.png",
    "contents.97dea73a.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox-mv2-prod@checkfragment.com"
    }
  }
}