Function over Form.

It's not pretty, but the minimal interface is intuitive enough if you have preliminary understanding of how cookies are constructed. It gives a nice overview of all the cookies and its values. It's perfectly fine if you've used excel or deal with data on a regular bases.

Developer: If you want to simplify things. Make beginner and advanced modes. By default hide all search filters except 'Domain' and use fuzzy search since that's what most people are going for anyways. Ctrl+Shift Selection if possible and Inline editing couldn't hurt either.