Examine source code of Easy Job Room

{
  "manifest_version": 3,
  "name": "Easy Job Room",
  "version": "2.0",
  "description": "Be faster with Easy Job Room",
  "permissions": [
    "tabs",
    "storage"
  ],
  "host_permissions": [
    "https://app.easyjobs.ch/*",
    "https://app.easyjobroom.ch/*",
    "https://api.easyjobroom.ch/*",
    "http://localhost:3000/*",
    "http://localhost:3001/*",
    "https://accounts.google.com/*",
    "https://www.googleapis.com/*",
    "https://*.linkedin.com/*",
    "https://www.job-room.ch/*",
    "https://*.jobup.ch/*",
    "https://*.indeed.com/*",
    "https://*.jobs.ch/*"
  ],
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "oauth2": {
    "client_id": "661782168709-s9nei3o14p88861anqb4v6gu8m5gdhfm.apps.googleusercontent.com",
    "scopes": [
      "https://www.googleapis.com/auth/userinfo.email",
      "https://www.googleapis.com/auth/userinfo.profile"
    ]
  },
  "action": {
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png"
    }
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "easyjobroom@example.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "sidebar_action": {
    "default_panel": "src/pages/side-panel.html",
    "default_title": "Easy Job Room"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.easyjobroom.ch/*",
        "https://*.job-room.ch/*",
        "https://*.jobup.ch/*",
        "https://*.indeed.com/*",
        "https://*.jobs.ch/*",
        "https://*.linkedin.com/*",
        "http://localhost:3000/*",
        "http://localhost:3001/*"
      ],
      "js": [
        "contentScript.js"
      ]
    },
    {
      "matches": [
        "https://www.job-room.ch/work-efforts/create"
      ],
      "js": [
        "content.js"
      ]
    },
    {
      "matches": [
        "https://www.job-room.ch/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content-styles.css"
      ]
    }
  ]
}