Examine source code of change text style

{
  "manifest_version": 2,
  "name": "change-text-style-addon",
  "description": "change text style",
  "version": "2026.6.13.1",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "change-text-style-addon-20250512@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs",
    "webNavigation",
    "scripting",
    "storage"
  ],
  "icons": {
    "48": "icons/48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "page_action": {
    "default_icon": {
      "48": "icons/48.png"
    },
    "show_matches": [
      "<all_urls>"
    ],
    "hide_matches": [
      "*://*.mozilla.org/*"
    ]
  },
  "content_scripts": [
    {
      "exclude_matches": [
        "*://*.mozilla.org/*"
      ],
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentjs/panel.js"
      ]
    }
  ]
}