Examine source code of RxJs watcher

{
  "name": "RxJs watcher",
  "version": "1.1.1resigned1",
  "manifest_version": 2,
  "description": "Devtools panel to visualize rxjs observables",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "devtools_page": "devtools.html",
  "content_security_policy": "script-src 'self' 'sha256-mimaz2CI1GIvGgTUAbBhnLUVCuVsL3squQrs/pvhB+A='; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{41033b2e-54b2-4b1f-a1b6-0d90ea9a9690}"
    }
  }
}