Hey @Vlad !
Functionally, I don't see any problem with the current solution.
Aesthetically, I have the impression that the designer of Mozilla Thunderbird has added a feature to Safari 🙂
As for the choice, that depends on Orion's future ambitions.
My favorite is the last one (icon in the toolbar) for the following reasons:
- Non-invasive and friction-less
- Page-independent (size, colors, etc.)
- Search engine branding
- Allows services to evolve with fewer ergonomic constraints
- Aesthetically more modern