Thanks for pointing that out! It appears that article hasn't been updated.

The drop-down menu now reads "today", meaning anything from midnight to the current time.

Hope this helps.

Would, however, be better to add more time frames such as 6h, 12h, 24h, 48h…

I agree. It probably would be better to introduce some more time frames since there's not currently any middle-ground between "today" and "everything".

If you want to leave feedback for Firefox developers, you can go to the Firefox Help menu and select Submit Feedback... or use this link. Your feedback gets collected by a team of people who read it and gather data about the most common issues.

Sorry to say, I just tested it again.

Since updating to the last 2 versions of FF, something changed!

It deletes far more then it should. If I delete "last 4 hours" it deletes also some cookies from over a day.

It used to work now for very long time, very reliable. Since 4-6 weeks I observe this strange behavior. I guess it has to be since FF 65.

Something else:

If I log-in to, e.g. "X.com" I'm receiving cookies like:

''x.com www.x.com nimg.x.com''

If I delete www.x.com and nimg.x.com on CHROME I'm still logged-in. If I used to the delete these cookies with older versions of FF, same thing.

NOW: Since a few weeks: Im logged-out immediately and have to log-in again!

This is new and bad behavior!

To the other subject: Why not just add a delete data for… and then you can write in by yourself how many minutes?