The issue:

Android users with Firefox can't access Google Search (including intl sites and localized domains like google.de, .co.uk, .com.br). Instead, they see a blank page.

Cause:

A server-side bug on Google's end related to User-Agent (UA) sniffing, which serves an empty page to newer Firefox versions.

Affected versions:

All Firefox versions on Android (>= 65) including Mobile 121.0, Nightly 123, and older.

Chrome not affected:

The bug is specific to Firefox.

Solutions:

• Use a different browser (Chrome, etc.) or search engine (DuckDuckGo).

Advanced users can:

• Change Firefox's UA in developer settings or with add-ons.

• Request the desktop version of Google from Firefox settings (region-dependent).

Status:

• Problem identified as critical and escalated.
• Still unresolved at the time of reporting.

Additional notes:

• Disabling Firefox's Enhanced Tracking Protection doesn't fix the issue.
• Some users report google.co.in loading the desktop site instead of mobile.