Hello!

We’ve rolled out a new Opera Stable release (version: 135.0.5973.123) with a new tab order preference for vertical tabs, and a round of stability and UI fixes.

Key highlights

• Backported the fix for CVE-2026-87491
• Added a preference to control where new tabs open in vertical tabs, available in both Settings and Easy Setup, (enabled the flag #new-tab-on-top on all streams) -> read more here: We’re turning Vertical Tabs upside down in Opera
• Added support for the chrome.sidePanel API: extensions can now render their own side panels, complete with a top bar
• Fixed traffic lights not reacting to hover on macOS 26
• Fixed bookmarks bar disappearing after exiting full screen
• Fixed crashes in tab media list refresh, tab collection move logic, and Vertical Tabs-related crashes on macOS
• Fixed close button not being visible in collapsed tabs after clicking it
• Fixed a stray single-tab island being created when opening split-screen links, and fixed dragging a split-screen tab into a tab island
• Fixed WhatsApp panel not opening with its shortcut
• Fixed the search-copy popup appearing in random places

You can find the full list in the changelog.

EDIT: We have temporarily disabled Acceptable Ads to resolve the issue where pages were not loading while Adblock was active. This change will take effect after you restart Opera twice. We apologize for the inconvenience.

Happy browsing

Installation links:

• Opera Stable for Windows
• Opera Stable for macOS
• Opera Stable for Linux – deb packages
• Opera Stable for Linux – RPM packages
• Opera Stable for Linux – snap package

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