I always used Opera up until version 12.17 and the I went to Firefox. I have decided to give Opera another try and it all went wrong.
I lost all my customisation, settings, style etc. and I didn't have a clue how to get them into the new version 25. When I used to update Opera all my settings went with it.

Fortunately I still have my old Opera 12.17 and wondered if there were any problems carrying on using it or is there a way to make version 25 look and behave like 12.17.

Thenak you