I use a Chrome extension called Pig Toolbox to get all these features. Takes a while to set it up, but after that I have most of my Opera 12.16 workflow back and some extra. It has some features I would have really enjoyed in opera back in the day, like the thing they call super gestures or a context menu for selected text that allows you to translate selections and read them out to you. Honestly, the best extension I ahve ever used. It really transforms the browsers that can use it.
The only reason I am using Opera instead of Chrome is because I like the design a bit better. Without this extension I would have switched. And in case a future update breaks compatibility without adding something substantial like fully customisable mouse gestures I will happily make Chrome my main browser.

EDIT: Interesting... A recent Chrome update has broken compatibility.
So now this Chrome extension works better with Opera than with Chrome... I guess once Opera does something similar I am screwed. Better look for Firefox extensions.