Multiple rows of tabs, colouring tabs

My request is for the tab-bar to offer the option of multiple rows of tabs. When I am working with a lot of files at once it would be really helpful to see them all as tabs (rather than hidden in a menu), and get to learn where they all are.

Colouring rows or individual tabs, either arbitrarily or with simple rules (e.g. colouring by file-type) would be super helpful too.