Examine source code of Viewhance

{
  "manifest_version": 2,
  "default_locale": "en",
  "version": "2022.924.1640",
  "name": "Viewhance",
  "description": "__MSG_appDescriptionShort__",
  "homepage_url": "https://deathamns.github.io/Viewhance/",
  "author": "Deathamns",
  "icons": {
    "128": "icon.png"
  },
  "permissions": [
    "<all_urls>",
    "storage",
    "webRequest",
    "webRequestBlocking"
  ],
  "optional_permissions": [
    "webNavigation"
  ],
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/app.js",
        "js/viewer.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/opener.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{00000c4c-fcfd-49bc-9f0d-78db44456c9c}"
    }
  }
}