Google Keep is stupidly configured, with only 12 colors (11 colors + no color) for, presumably, an unlimited number of labels. Keep also lacks the ability to create sublabels. So if you have more than 12 labels and want to distinguish them by color, you wind up using the same color for more than one label, which is okay up to a point, but unsatisfactory overall. Hence, creating tabs for categories/labels based only on color is far from being truly useful. If the extension also made it possible to create more customized colors, that would help. But even then, choosing and then recognizing a unique color for each label would be a chore as the number of labels increases, which for me is inevitable. (There are taker-outers and putter-inners. I'm a putter-inner.)

This was great, but it no longer works.
I have it on chrome though so perhaps they are only supporting that version now

Very good

This is a very useful Add-on for firefox. It is a shame that it cant be used on other platforms but being able to organise in Firefox is fine by me. Very good!
12/10/18 Doesn't work any more. Cant access support or the developers website.

Awesome

Awesome app