I finally decided to give new Opera a try.
I got all this extensions idea - and must agree it's not bad at all.
For quick notes I installed Nimbus notes
For sessions saving - Session box
For password management - Lastpass
The only thing remained compared to Opera 12.17 - Bookmarks sync.
I can't find working extension for this
I tried Xmark - it doesn't sync at all.
After reinstall it uploaded only Imported bookmarks folders and Bookmarks bar and none of My folders bookmarks and Unsorted boomarks. Thus I can't get it work properly.
Tried Eversync - it says "Bookmarks sync is not active" even after I was forced to install and sync FVD Speed Dial.
Speed Dial sync worked and bookmarks sync was still not active - no option in settings activate\deactivate and no single hint what should I do to activate it. Deinstalled it too.
Please recommend good bookmark sync extension that will work in Opera25.
Sadly these are not the only extensions not working\working badly in Opera25. At least for me.
But I still going to give it a chance.
Also I've seen post here about good working bookmark sync in Opera 26 - ok good news but when it will be available for all?