Native <select> in extension popup freezes the browser

## Description

Clicking a native `<select>` dropdown inside a browser extension popup freezes the entire popup (and sometimes the browser). The popup becomes completely unresponsive — no clicks, no interactions, nothing.

This does **not** happen in Firefox or Waterfox with the same extension.

## Steps to Reproduce

1. Clone the minimal repro extension: https://github.com/rxliuli/zen-select-bug-repro
2. Open `about:debugging#/runtime/this-firefox`
3. Click "Load Temporary Add-on" → select `manifest.json`
4. Click the extension icon to open the popup
5. Click the `<select>` dropdown

**Expected:** The dropdown opens and you can select an option.
**Actual:** The popup freezes immediately when clicking the `<select>`.

https://github.com/user-attachments/assets/96c24eb7-908a-4813-9343-1afe986dcd5f

https://github.com/user-attachments/assets/5edcce2d-4dd7-4088-9bcc-5f601db3f530

## Minimal Repro Code

The extension is just 3 files — no frameworks, no dependencies:

**manifest.json**
```json
{
  "manifest_version": 2,
  "name": "Zen Select Bug Repro",
  "version": "1.0",
  "description": "Minimal repro: native <select> in extension popup freezes Zen browser",
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Select Bug Repro"
  }
}
```

**popup.html**
```html
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <style>
    body { width: 250px; padding: 16px; font-family: system-ui, sans-serif; }
    select { width: 100%; padding: 6px; font-size: 14px; }
  </style>
</head>
<body>
  <h3>Select Bug Repro</h3>
  <p>Click the select below. On Zen browser, this freezes the popup.</p>
  <select id="lang">
    <option value="en">English</option>
    <option value="zh">Chinese</option>
    <option value="ja">Japanese</option>
  </select>
  <p id="result">Selected: en</p>
  <script src="popup.js"></script>
</body>
</html>
```

**popup.js**
```js
document.getElementById('lang').addEventListener('change', (e) => {
  document.getElementById('result').textContent = 'Selected: ' + e.target.value
})
```

## Environment

- Zen Browser (latest)
- macOS
- Works fine in: Firefox, Waterfox, Chrome

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Uh oh!

Native <select> in extension popup freezes the browser #13623

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Uh oh!

Native <select> in extension popup freezes the browser #13623

Description

Description

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Minimal Repro Code

Environment

Metadata

Metadata

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Type

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Development

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