Black outlined pins in drop-down window for Extension Management are highlighted with black color on mouse hover, making these very well hidden.

Altered values in opera://flags/ have no combo box appearance, these look like statically set and unalterable, which these aren't.

Since update to R2, Opera One consumes too much memory for huge amount of tabs.

For around 1700 tabs, each loading few dozen Kb pages, opera processes in memory seize around 7 Gb.
For around 2000 tabs of the same kind, memory consumption grows exponentially up to around 11 Gb.

It also releases memory really slow after is used command Close all other tabs or Close tabs on the right.