Examine source code of strava-map-switcher

{
  "name": "strava-map-switcher",
  "version": "0.20.1",
  "manifest_version": 3,
  "description": "Map switcher for Strava website",
  "homepage_url": "https://github.com/liskin/strava-map-switcher",
  "icons": {
    "128": "icons/icon128.png"
  },
  "permissions": [
    "declarativeNetRequestWithHostAccess"
  ],
  "host_permissions": [
    "https://www.strava.com/*",
    "https://mapserver.mapy.cz/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.strava.com/*"
      ],
      "js": [
        "inject.js"
      ]
    }
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "mapy_cz",
        "enabled": true,
        "path": "rules_mapy_cz.json"
      }
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "3rd/Leaflet.GoogleMutant.js",
        "3rd/jquery-3.5.1.min.js",
        "3rd/leaflet-pegman.min.css",
        "3rd/leaflet-pegman.min.js",
        "arrive.min.js",
        "common.js",
        "donation.js",
        "fix-mapbox.js",
        "fix.js",
        "layers.js",
        "load.js"
      ],
      "matches": [
        "https://www.strava.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8bc8a884-a7db-45e3-84dd-963933a87d3c}"
    }
  }
}