Examine source code of Elium

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "1.121.0",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "64": "icons/64.png",
    "128": "icons/128.png",
    "192": "icons/192.png",
    "256": "icons/256.png"
  },
  "default_locale": "en",
  "permissions": [
    "cookies",
    "scripting",
    "storage",
    "tabs",
    "https://*.elium.com/*"
  ],
  "optional_permissions": [
    "<all_urls>"
  ],
  "sidebar_action": {
    "default_panel": "panel.html",
    "default_title": "Elium",
    "open_at_install": true,
    "default_icon": {
      "16": "icons/16.png",
      "32": "icons/32.png",
      "64": "icons/64.png",
      "128": "icons/128.png",
      "192": "icons/192.png",
      "256": "icons/256.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "extension-ff@elium.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "websiteContent"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.elium.com/extension-login*",
        "*://localhost/extension-login*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/auth_success.js"
      ]
    }
  ]
}