Examine source code of Geneanet Source Annotator

{
  "manifest_version": 3,
  "name": "Geneanet Source Annotator",
  "version": "0.2.1",
  "description": "View Geneanet data on Matricula! Links your Geneanet tree to Matricula Online, showing person/event details & profile links on source pages. All data processed locally for your privacy.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{11aa3805-0687-43bd-9708-fd6421f88745}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "alarms",
    "tabs"
  ],
  "optional_host_permissions": [
    "<all_urls>"
  ],
  "host_permissions": [
    "https://gw.geneanet.org/*src=on*"
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://gw.geneanet.org/*src=on*"
      ],
      "js": [
        "content_scripts/geneanet_source_fetcher.js"
      ]
    },
    {
      "matches": [
        "https://data.matricula-online.eu/*"
      ],
      "js": [
        "content_scripts/matricula_annotator.js"
      ]
    },
    {
      "matches": [
        "https://dfg-viewer.de/show?*"
      ],
      "js": [
        "content_scripts/dfg_annotator.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "css/main.css",
        "css/injected.css",
        "css/highlights.css",
        "content_scripts/matricula_highlighting.js",
        "content_scripts/dfg_highlighting.js"
      ],
      "matches": [
        "*://data.matricula-online.eu/*",
        "*://dfg-viewer.de/*"
      ]
    }
  ],
  "action": {
    "default_popup": "popup/popup.html"
  }
}