Too many tabs? One press, and your browser tidies its own tabs into groups.
Why it matters
Too many tabs is so common that it has its own name, tab hoarding, and its own section on Wikipedia.
Finding one tab means reading tiny titles one by one, and sorting them by hand takes longer than it is worth. So nobody does it.
Design decisions
Organize sits under the tabs, with its name on it.
The toolbar is for the page you are looking at: back, reload, the address. Organize acts on the list of tabs, so it sits right under that list. It carries its name because an icon alone does not say what it does.
Groups you name stay yours.
When you organize again, Starling re-sorts only the groups it made. A group you named stays exactly as you left it, with the same tabs inside.
How it works
Organize does the sorting you would do by hand.
Why two steps and not one: in a test with 43 tabs, asking a single model to do the whole job took 8 to 19 seconds, and the groups were no better. Grouping first and naming second takes about a second.
More applications
The same button could work on anything that piles up and never gets sorted: downloads, screenshots, saved links.
Downloads
Screenshots
Saved links