Examine source code of Capital Koala

{
  "name": "Capital Koala",
  "version": "9.0.0.4",
  "manifest_version": 3,
  "description": "Bouton d'aide à l'achat Capital Koala pour Firefox",
  "browser_specific_settings": {
    "gecko": {
      "id": "toolbar@capitalkoala.com",
      "strict_min_version": "109.0"
    }
  },
  "icons": {
    "16": "./img/icon-16.png",
    "19": "./img/icon-19.png",
    "48": "./img/icon-48.png",
    "64": "./img/icon-64.png",
    "128": "./img/icon-128.png"
  },
  "action": {
    "default_icon": "./img/icon-19.png",
    "default_popup": "popup.html"
  },
  "optional_permissions": [
    "tabs",
    "cookies",
    "activeTab"
  ],
  "permissions": [
    "tabs",
    "cookies",
    "activeTab",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.bin.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_end",
      "js": [
        "contentscript.bin.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "img/promos-icon.png",
        "img/green-bar-icon.png",
        "img/red-bar-icon.png",
        "img/promotion_1_128x128.png",
        "img/promotion_2_128x128.png",
        "img/promotion_3_128x128.png",
        "jquery3.0.js",
        "jquery-ui.min.js",
        "refwarning.html",
        "refwarning.bin.js",
        "tos.html",
        "tos.bin.js",
        "config.html",
        "config.bin.js",
        "html4-defs.js",
        "uri.js",
        "html-sanitizer.js",
        "cssparser.js",
        "csslexer.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ]
}