Cookiebro is a functional cookie manager but UI needs some work and UX improvements.
For example: Current search implementation in cookies editor is of little use when there are more than a few dozen sites with cookies and I have 477 sites. Filtering and displaying only matching entries would be a much better approach. Just like the old Firefox cookies manager or about:config page.
I'd like to also suggest merging all different add-on pages in a single page with tabbed UI.