MozillaZine

Why Are Firefox Cookies Left Behind?

User Help for Mozilla Firefox
BrowseMail
 
Posts: 173
Joined: January 1st, 2011, 10:07 am

Post Posted January 21st, 2018, 7:02 am

Hi,

I have Firefox set to keep cookies only until the browser is closed (and disabled third-party cookies). Firefox doesn't show any cookies being kept otherwise. However, when I run CCleaner it shows there are still Firefox cookies left behind. Can anyone explain why this might be happening? I am using Firefox 57.0.4 on Windows 7 Pro.

Thanks.

Brummelchen
 
Posts: 3844
Joined: March 19th, 2005, 10:51 am

Post Posted January 21st, 2018, 9:16 am

when I run CCleaner it shows there are still Firefox cookies left behind.

thats fake, forget ccleaner and firefox together. you already were told to leave ccleaner behind:
viewtopic.php?f=38&t=3037557&p=14788467#p14788467
where is the problem to trust in such experience?

if you want to keep cookies you have to set exceptions in cookie handling (allow). no entry means deleted.
https://support.mozilla.org/en-US/kb/en ... references
(use custom setting)

and be sure not to work in a private window.

BrowseMail
 
Posts: 173
Joined: January 1st, 2011, 10:07 am

Post Posted January 21st, 2018, 11:20 am

I am not going to use CCleaner to clean or compact Firefox - but perhaps planning on using CCleaner to delete Flash cookies (not Firefox cookies).

However, if I do an "Analyse" of Firefox cookies with CCleaner (this does not change anything in Firefox, so no risk), I see extra cookies not shown in Firefox. I would not consider these as "fake" as they are relating to web sites I have visited previously.

I found this link, which seems to explain why this is happening:

https://forum.piriform.com/topic/45043- ... n-firefox/

"I found out it's caused by super cookies in SiteSecurityServiceState.txt, these cookies can't be deleted by Firefox."

So it looks like CCleaner is finding these "super cookies" in SiteSecurityServiceState.txt.

Regardless of CCleaner, is SiteSecurityServiceState.txt anything to be concerned about from a privacy point of view?

RobertJ
Moderator

User avatar
 
Posts: 10678
Joined: October 15th, 2003, 7:40 pm
Location: Chicago IL/Oconomowoc WI

Post Posted January 21st, 2018, 1:19 pm

BrowseMail wrote:Firefox doesn't show any cookies being kept otherwise.


That is because they are gone.

BrowseMail wrote:
However, when I run CCleaner it shows there are still Firefox cookies left behind. Can anyone explain why this might be happening? I am using Firefox 57.0.4 on Windows 7 Pro.

That is because CCleaner fails to clear its cache. CCleaner is crapware.

CCleaner is known to cause issues with Firefox.

Image

.
FF 63.0.1 - FF 64b8 - FF 65a - TB 60.3 - Mac OSX 10.13.6
Computers I've used: IBM 7094/UNIVAC 1108/IBM 360/DEC PDP11/DEC VAX-11 780/DEC VAXstation 8000/Sun SPARCstation 2/Mac from 1984 to 2018

therube

User avatar
 
Posts: 19154
Joined: March 10th, 2004, 9:59 pm
Location: Maryland USA

Post Posted January 22nd, 2018, 11:51 am

Flash cookies (not Firefox cookies)

AFAIK, deleting FF cookies deletes the respective Flash cookies.
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.19) Gecko/20110420 SeaMonkey/2.0.14 Pinball CopyURL+ FetchTextURL FlashGot NoScript

Brummelchen
 
Posts: 3844
Joined: March 19th, 2005, 10:51 am

Post Posted January 23rd, 2018, 12:21 am

if not
https://addons.mozilla.org/en-US/firefo ... h-cookies/

(i dont use flash any longer, assuming futile)

BrowseMail
 
Posts: 173
Joined: January 1st, 2011, 10:07 am

Post Posted January 23rd, 2018, 11:39 am

AFAIK, Flash cookies are stored separate to regular cookies by Flash Player, which aren't deleted by Firefox itself. Flash cookies are also accessible across different browsers.

Clear Flash Cookies looks good but I would like to see more options (like a whitelist). BetterPrivacy was great but it no longer supports WebExtensions.

RobertJ
Moderator

User avatar
 
Posts: 10678
Joined: October 15th, 2003, 7:40 pm
Location: Chicago IL/Oconomowoc WI

Post Posted January 23rd, 2018, 12:36 pm

BrowseMail wrote:Flash cookies are also accessible across different browsers.


But they are not the same cookies. For example on Mac

Firefox flash cookies are here: ~/Library/Preferences/Macromedia/Flash Player/#SharedObjects/

Chrome flash cookies are here: ~/Library/Application Support/Google/Chrome/Default/Pepper Data/Shockwave Flash/WritableRoot/#SharedObjects/


.
FF 63.0.1 - FF 64b8 - FF 65a - TB 60.3 - Mac OSX 10.13.6
Computers I've used: IBM 7094/UNIVAC 1108/IBM 360/DEC PDP11/DEC VAX-11 780/DEC VAXstation 8000/Sun SPARCstation 2/Mac from 1984 to 2018

therube

User avatar
 
Posts: 19154
Joined: March 10th, 2004, 9:59 pm
Location: Maryland USA

Post Posted January 24th, 2018, 9:55 am

Flash cookies are stored separate to regular cookies by Flash Player

Right. That's always been the case.


AFAIK, deleting FF cookies deletes the respective Flash cookies.

which aren't deleted by Firefox itself

I had been under the impression that it did that, but seems it does not, at least in testing it is not?

URL: http://www.republicofcode.com/tutorials ... redobject/

This sets a republicofcode.com "flash cookie" (LSO) [in addition to FF cookies].

Clear FF cookies.
Verify that the republicofcode.com "flash cookie" persists.


(BTW, disable Flash & ... no flash cookies ;-). Where's the milk?)
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.19) Gecko/20110420 SeaMonkey/2.0.14 Pinball CopyURL+ FetchTextURL FlashGot NoScript

BrowseMail
 
Posts: 173
Joined: January 1st, 2011, 10:07 am

Post Posted January 24th, 2018, 12:55 pm

RobertJ wrote:But they are not the same cookies.

As Chrome comes bundled with Flash Player (Flash Player updates are part of Chrome updates), perhaps Chrome stores its Flash cookies in a different place to Flash cookies from other browsers like Firefox.

RobertJ
Moderator

User avatar
 
Posts: 10678
Joined: October 15th, 2003, 7:40 pm
Location: Chicago IL/Oconomowoc WI

Post Posted January 24th, 2018, 1:01 pm

.
Each browser, at least on Mac, stores the flash cookies in different places. In particular Firefox, Chrome, Safari and Opera. Edge does not run on Mac.

.
FF 63.0.1 - FF 64b8 - FF 65a - TB 60.3 - Mac OSX 10.13.6
Computers I've used: IBM 7094/UNIVAC 1108/IBM 360/DEC PDP11/DEC VAX-11 780/DEC VAXstation 8000/Sun SPARCstation 2/Mac from 1984 to 2018

Return to Firefox Support


Who is online

Users browsing this forum: No registered users and 12 guests