I agree with laingman.
I immediately toggled back to the old style tabs view (using classic UI).
With the current page in the background, the whole browser has more overview. You can more easily check "what the other tabs were", can remove needless tabs without losing your focus on the contents you are currently reading and you can quickly switch back to the webview-only display just by hitting somewhere of the current page contents. Thus, you don't need to pain your head with "where was I?" and search for the tab and butttons.
This is very reasonable when you have a "main theme" and "research stuffs" to deal with the theme, e.g. Shopping - Amazon result page is on the main tab, the other tabs are articles about the products.
To me, the old style is one of the "operanized" nice points and the reasons why I've choosing Opera on Android.
The new style is rather a "degeneration" to the common millions browsers and is so much unreasonable as the others in tabs management.