Nothing more to say than what ashleedawg already wrote on March 28th 2019:
"WHO KNOWS what Mozilla was thinking when they took a step *backwards* in terms of empowering users to manage their own Security & Privacy by removing the ability to View Individual Cookies... but the up-side is that it caused me to discovered THIS add-in, which is *infinitely better* than Firefox's old built-in features.".
Fully agreed!

Cookie Quick Manager is one of the best addons by Ysad

Doesn't work with 67.0.1 (64-bit) version.
While opening "Manage All Cookies" the list of domains is empty.
Answer from the author:
Go to the add-ons page, click on the "Cookie Quick Manager" add-on to get to the details page for the add-on, scroll down to the part that says "Run in Private Windows" and select the "Allow" option.
Until I did this the "All" context would not show anything and some of the other contexts would also be missing cookies. I assume this is because when it tried to enumerate all the cookies, it would hit the "private" cookies and was denied access and instead of just continuing it would halt/crash the add-on.

WHO KNOWS what Mozilla was thinking when they took a step *backwards* in terms of empowering users to manage their own Security & Privacy by removing the ability to View Individual Cookies... but the up-side is that it caused me to discovered THIS add-in, which is *infinitely better* than Firefox's old built-in features.

Ten minutes with this app and I've already learned a bunch of stuff I didn't realize before, in terms of who's tracking me how/where/when, PLUS the ability to modify your cookies so that you're sharing what you want to, when you want to.

Now all I need in an in-depth tutorial about different types of cookies, pros/cons, and so on.

Great job Ysard, thank you.

The best cookie manager I have tested (and I have tested a lot, if not them all!) The pop-up menu shows all the expected options for quick use (find and delete), plus, it also has a convenient option to delete Local Storage, what can be really handy (in a quick glance, it informs if the site is using local memory, giving the option to clear it).

Great extension, very well done. I noticed a recent change: for cookies that are in a Firefox container, the container icon no longer appears. It used to be just to the left of the number of cookies for the site, in the Domains column - ?