Dear Opera Users,

New Opera Developer is here, starting version 125.

Here’s what’s new in this build:

• New feature: Tab Island customization is now enabled!
  Read more about it in our dedicated post → Tab Island Customization
• Chromium updated to version 140.0.7339.208
• Fixes:
  • Crash on Linux (KDE) – lottie::Animation::GetOriginalSize
  • Content not displayed on opera:activity
  • Split screen now fills the whole web UI area
  • Tab Island name appears correctly when created via drag & drop
• Bugfix CHR CVE-2025-12433 (V8 security fix)

For a full list of changes check out our changelog.

Thank you for being part of the Opera community!

Installation links:

• Opera developer for Windows (Using the Opera developer for Windows installer means you have accepted the Opera for Computers EULA)
• Opera developer for Windows (Portable version)
• Opera developer for macOS
• Opera developer for Linux – deb packages
• Opera developer for Linux – RPM packages

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