How to prevent or delete adobe flash cookies Firefox 57
In one of the recent updates, you disabled Better Privacy, an add-on that deletes Adobe Flash "supercookies". You didn't tell us you were doing it, so I don't know when it happened. After some time searching, I learned that you think that Firefox contains its own facility to handle the same functions as Adobe Flash and that thus you think there's no need for add-ons like BP. Unfortunately, not all web sites are reading from your hymn book. Some of them still require Adobe Flash, and allowing that to run is slobbering those damned supercookies all over my hard drive, I'm sure, but now I have no way to know if they're there, nor to delete them if they are. How do I find out whether I have them? How do I get rid of them if I do?
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As an additional general comment, it would be really nice if when you disallow an add-on, you would please TELL us that you're doing and why. Finding out sometime later that you've done it is not as pleasant a surprise as you may think. And some of them that you've disabled like that have no replacement, such as Close 'n Forget It, which I used for years, but which you've now blocked without any way to accomplish the same task it did.
Thanks.
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Note that Firefox has other types of storage like IndexedDB and session storage that follow the same allow/block rules as set for cookies.
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The Better Privacy extension let you manage Flash Local Storage Objects (LSO's) sometimes called supercookies. Adobe has some pages to let you view and delete them. A little less convenient but depending how many you are accumulating, this may be good enough?
Flash needs to be allowed on the pages for the storage manager dialogs to work:
General Storage Settings http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager03.html
Site-Specific Storage Settings http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager07.html
(Macromedia is the company that originally developed Flash, and it was acquired by Adobe a long time ago, so that server is legit.)
https://www.howtogeek.com/333230/why-firefox-had-to-kill-your-favorite-extension/ If it was part of discontinued Legacy addons, all addons on your page had a big yellow box beside each and in black letters Legacy for over 6mos before the release of version 57 November 14th. If you go to your Extensions page at page top you will see missing something. Click on that and there will be a Blue Box next to Better Privacy suggesting a alternative. I would think. The Developer of the Program withdrew it from the site. Can not find out the date : https://addons.mozilla.org/en-US/firefox/extensions/
If you would care to preach to here : To submit suggestions for new or changed features, may I suggest: Feedback: https://qsurvey.mozilla.com/s3/FirefoxInput/ as Volunteer Support can not make changes to Firefox or pass on your information you have, we just help.
Please let us know if this solved your issue or if need further assistance.
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Note that Firefox has other types of storage like IndexedDB and session storage that follow the same allow/block rules as set for cookies.