Cookie Quick Manager is a nice tool for web dev to check set and test cookies. Interface is clean and it works well.

dear dev, please please please add dark thme. this addon very useful for me.

Creio ser bem fácil de usar e ultil vou testar depois falo mais ,mas parecendo pela explicação ser o que estava procurando!

Where Firefox 72 failed, Cookie Quick Manager succeeded.

https://old.reddit.com/r/firefox/comments/ejy2kv/wayback_machine_pages_webarchiveorg_urls_work/fd4s5hz/?context=3

– pages that previously worked only in private windows began working in normal windows, after Cookie Quick Manager successfully removed the offending data.