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.)