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Sessions & Tab Management
This is something that Opera doesn't seem to get.
Years ago it was ahead of the game with its Sessions, but it was always clunky & a PITA to deal with multiple windows.
To me FF has the best solution with the Session Manager extension & Session Buddy in Chrome is not too bad (now loaded into Opera thanks to some kind soul- I was on the cusp of having to give up on Opera).
You should be able to pick tabs to save, from any window. Ideally consolidate them into one window.
The 'save as speed dial group' just saves ALL the Opera windows to a group. What use is that if I want to segregate & compartmentalise my browsing? It is a huge productivity hit.
And my Opera 12 sessions - what can I do about them?