How do I get vertical tabs style in opera 22+?
You might try the Chrome extension, Veritabs. You can get tabs on the left side of the browser. And then you could go to full screen mode (in Windows 7, press f11), and still access them on the side of the browser.
Here's a review on CNET
To download a Chrome extension easily, you need the Opera extension, called Download Chrome Extension, https://addons.opera.com/en/extensions/details/download-chrome-extension-9/?display=en
or Extension Source Viewer, https://addons.opera.com/en/extensions/details/extension-source-viewer/