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.

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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