Current Firefox flagged as unsupported browser
Mailcheck wrongly tells current Firefox versions that the browser is unsupported and blocks mailbox access.
Tier II · Emerging Problems that are still building up.
3 public reports · first reported 6 October 2018 · last reported 6 July 2026
What's going wrong
The WEB.DE MailCheck add-on sometimes shows an unsupported or outdated browser warning on current Firefox releases.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 3 reports are about, and how many came each month.
- Related problems.
No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.