Hey guys
Thanks for answering
First thing to tell : I'd tried to use "exclude" option for my precious cookies, but after 5 minutes checking, I gave up => I have tons of cookies lol
Second, Jamin4u advice doesn't do the job....but (hahaha I'm so dumb sometimes) I noticed there is (where he told to have a look for flash) a Firefox cookies option too
Erf...my mistake....so I unchecked it and now CC doesn't try to delete my cookies
Earlier, as I said in my 1st post, I didn't have Firefox installed yet hehe ^^
I must apologize, because I would have to check everywhere in CC options.
Well, now all is running like a charm, so THANK YOU for your good advices, guys !
EDIT : oops, this was not a bug, excuse me. Feel free to move or delete my thread