How I rated the add-on:
Did the add-on work as you expected it to? Yes, the add-on is worth 5 stars.

However, anytime I use this add-on, Firefox starts to consume super-high RAM and becomes unresponsive for 5-10 minutes. If I forcefully close Firefox, I receive a browser crashed notification within the same amount of time. -2 stars (can get pretty inconvenient)

Just because I have this problem doesn't necessarily mean you will.

What features did I like or dislike? I like all features, and there is none I dislike.

Is it useful? Very useful add-on
Is it easy to use? It is easy to use.
Will I continue to use this add-on? For now.

Other notes:
Creating a new account elsewhere to make the creator aware of bugs is totally unnecessary. -2 stars

Creator is attentive and still reads reviews. +2 stars

Creator will try to fix issue if you're willing to make a GitHub account. +1 star (I'm not willing to)

Exactly what I need. Bravo.

Nice Very Gud!

Excellent, better than many other cookie cleaner I've tried and also removes supercookies/indexeddb etc.

The best 1!1!1!

Really handy addon

Works flawlessly. Useful extension. Thanks.

works great

Very nice. But doesn't appear to clear the download history.

Perfect! Thanks for adding the longer clearing time span and the local storage fix.