Examine source code of OUI Light

{
  "manifest_version": 2,
  "name": "OUI Léger",
  "homepage_url": "https://gitlab.com/raphj/oui-leger",
  "developer": {
    "name": "Raphaël Jakse"
  },
  "version": "2019.12.1",
  "description": "Rend OUI.sncf site plus rapide et plus léger.",
  "browser_specific_settings": {
    "gecko": {
      "id": "oui-leger@raph.jakse.fr"
    }
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://widget.rogervoice.com/*",
    "*://static.cdn-apple.com/*",
    "*://static.doyoudreamup.com/*",
    "*://*.oui.sncf/*",
    "*://krum.vsct.fr/*",
    "*://*.abtasty.com/*",
    "*://v.oui.sncf/*",
    "*://cdnjs.cloudflare.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.oui.sncf/",
        "*://*.oui.sncf/*"
      ],
      "js": [
        "content-script.js"
      ]
    },
    {
      "matches": [
        "*://*.oui.sncf/",
        "*://*.oui.sncf/*"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_start"
    }
  ]
}