Examine source code of Side-by-side Search

{
  "author": "Adrien Lacquemant",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "extension-content-only.js"
      ],
      "matches": [
        "https://side-by-side-search.vercel.app/*",
        "https://side-by-side-search.vercel.app/index.html",
        "file:///Users/adrien/git/side-by-side-search/frontend/index.html"
      ]
    },
    {
      "js": [
        "scroll-sync.js"
      ],
      "all_frames": true,
      "matches": [
        "https://google.com/search?igu=1&ei=&q=*",
        "https://search.brave.com/search?q=*",
        "https://duckduckgo.com/?q=*",
        "https://www.startpage.com/do/dsearch?query=*",
        "https://side-by-side-search.vercel.app/*",
        "file:///Users/adrien/git/side-by-side-search/frontend/*",
        "https://*/*"
      ],
      "run_at": "document_end"
    }
  ],
  "description": "Compare search results side by side on https://side-by-side-search.vercel.app/!",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "64": "icons/icon64.png"
  },
  "manifest_version": 2,
  "name": "Side-by-side Search",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "tabs",
    "<all_urls>"
  ],
  "version": "1.2.1"
}