It's possible that the issue you're encountering is related to privacy settings or browser-specific behavior in Opera GX. Here are a few steps you can take to troubleshoot and potentially resolve the problem:

1. Check browser settings:
Opera GX might have settings that block access to sessionStorage by default. Go to Opera GX settings and look for any options related to cookies, storage, or site data. Ensure that access to sessionStorage is allowed for your site.

2. Disable third-party extensions:
Some browser extensions may interfere with the functionality of your site. Try disabling any extensions you have installed in Opera GX to see if they are causing the issue.

3. Use feature detection:
Before accessing sessionStorage, you can use feature detection to check if it's available in the user's browser. This can help you avoid errors and provide an alternative storage method if necessary:

javascript code:
```
if (typeof sessionStorage !== 'undefined') {
  // sessionStorage is available
} else {
  // sessionStorage is not available; use an alternative method
}
```

4. Use an alternative storage method:
If the issue persists and you cannot rely on sessionStorage, consider using an alternative storage method, such as cookies or IndexedDB. This can help ensure that your site functions correctly across different browsers.

5. Report the issue to the browser vendor:
If you've determined that the issue is specific to Opera GX and you've ruled out other potential causes, consider reporting the issue to the browser vendor. They may be able to provide further guidance or fix the problem in a future update.

Remember that it's important to test your site across multiple browsers to ensure compatibility and provide the best possible user experience.
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