Examine source code of Gabel

{
  "manifest_version": 3,
  "name": "Gabel",
  "version": "1.1",
  "description": "Petit plugin pour aider à lire plus simplement quelques articles",
  "icons": {
    "16": "icon.jpg",
    "48": "icon.jpg",
    "128": "icon.jpg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "belgapresspublic@himad.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "*://web.belga.press/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Lire sur Belga.press"
  },
  "content_scripts": [
    {
      "matches": [
        "*://web.belga.press/*",
        "*://*.demorgen.be/*",
        "*://*.standaard.be/*",
        "*://*.tijd.be/*",
        "*://*.gva.be/*",
        "*://*.grenzecho.net/*",
        "*://*.hbvl.be/*",
        "*://*.hln.be/*",
        "*://*.nieuwsblad.be/*",
        "*://*.lavenir.net/*",
        "*://*.lecho.be/*",
        "*://*.dhnet.be/*",
        "*://*.lalibre.be/*",
        "*://*.lesoir.be/*",
        "*://*.levif.be/*",
        "*://*.sudinfo.be/*",
        "*://*.sudpresse.be/*",
        "*://*.7sur7.be/*",
        "*://*.apache.be/*",
        "*://*.cinetelerevue.be/*",
        "*://*.doorbraak.be/*",
        "*://*.eoswetenschap.eu/*",
        "*://*.feeling.be/*",
        "*://*.gael.be/*",
        "*://*.flair.be/*",
        "*://*.humo.be/*",
        "*://*.knack.be/*",
        "*://*.kw.be/*",
        "*://*.lessentiel.lu/*",
        "*://*.metrotime.be/*",
        "*://*.moustique.be/*",
        "*://*.parismatch.be/*",
        "*://*.trends.be/*",
        "*://*.lefigaro.fr/*",
        "*://*.telegraaf.nl/*",
        "*://*.volkskrant.nl/*",
        "*://*.nrc.nl/*",
        "*://*.ad.nl/*",
        "*://*.trouw.nl/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}