Vivaldi is a new browser from a team lead by Jon S. von Tetzchner, the co-founder of Opera.

It's Chromium-based, which ensures decent speeds, even for a Technical Preview. The user interface is built with JavaScript and React ("with the help of Node.js, Browserify and a long list of NPM modules", apparently).

The end result is streamlined and straightforward to use. Browser tabs at the top of the page, address and search bar below, a menu button top-left points to a few useful options (File > Import Data can import your bookmarks, passwords, history, and search engines from IE, Opera and Firefox).

A tabbed panel on the left gives access to various extras. A Notes section allows you to take text notes and screen shots, and add tags to any site. There are Downloads, Bookmarks and Contacts panels, too, as well as one for "Vivaldi Mail" (although a message explains this "is not ready") and a web panel option, which lets you pin frequently accessed web sites, feeds and other resources for easy access alongside the main browser window.

The Speed Dials page doesn't just display static thumbnails of your favourite sites. You can organise them by interest, context, add folders, and more.

Open too many sites and Vivaldi offers a new way to restore order. Dragging one tab over another creates a Tab Stack, where a single tab represents multiple sites. This works much like a group of buttons on the Windows taskbar: hover your mouse over the tab, thumbnails appear for each of the sites it represents, and you simply click the one you need.

There's also very good keyboard support via "Quick Commands". Press Ctrl+Q at any point and a menu appears listing all your open tabs and most important commands. Select whatever you want directly from the list, or press the listed hotkey (Ctrl+H for Notes).

This is the first stable release of Vivaldi.

What's new in v1.10 (see changelog for full list)?

- Browser that takes Start Pages seriously
- Developer Tools, now docked
- Sorting of Downloads in the Side Panel by name, size, date added and date finished, as well as manually.
- Toggle image visibility from the View menu or via configurable keyboard shortcut.
- Quick Commands improvements for users that like to control everything in their browser from their keyboard.
- The Quick Commands menu lets users navigate to tabs, find search terms, filter lists of available commands and much more.
- Address Bar dropdown list can now exclude bookmarks and typed history.
- Controlling new tabs via third-party extensions with additional functionality, such as productivity tools or reminders.

Verdict

Vivaldi's customisability and flexibility is joined by genuinely innovative features such as tab stacks and web panels to make it a genuine alternative browser for the power user.