I realize the process as I work in software development.
Since the feature was already included in previous versions of Opera, it would be a simple matter of moving the existing code from one version to the other.

Not looking for just the history..I specifically wanted the down arrow in the url field that let you quickly access previously visited sites.

Why that was removed at all I cant figure out.

Thank you for the extension information. I will check it out.

v 23.0.1522.75 to be precise

Sorry, version 23

Can someone please educate me on how to add the arrow that allowed me to view my browsing history in the URL field?