Cookies

Dreamwidth sets cookies in visitors' browsers. This is a list of the cookies that are set, why they are set, and what they do.

This is a work in progress.

Domain	Cookie Name	Cookie Contents	What/Why
.dreamwidth.org	BMLschemepref	name of preferred sitescheme (e.g. "tropo-red")	to allow choice of sitescheme while logged out
.dreamwidth.org	langpref	name of preferred language (e.g. "en")	[obsolete] set by BML::set_language
.dreamwidth.org	ljloggedin	combination of userid & sessionid	see LJ::Session->loggedin_cookie_string
.dreamwidth.org	ljuniq	persistent unique ID associated with device/browser	see LJ/UniqCookie.pm
.dreamwidth.org	no_mobile	set to opt out of mobile view	see DW/Setting/MobileView.pm
.www.dreamwidth.org	ljmastersession	combination of userid, sessionid, & auth	see LJ::Session->master_cookie_string
<username>.dreamwidth.org	ljdomsess.<username>	info for session on given user's subdomain	see LJ::Session->domain_cookie
.dreamwidth.org	__cfduid	hex string	Probably CloudFlare
.dreamwidth.org	__utma	from Google Analytics	more info
.dreamwidth.org	__utmz	from Google Analytics	more info
<username>.dreamwidth.org	__utma	from Google Analytics	more info
<username>.dreamwidth.org	__utmz	from Google Analytics	more info

Viewing preferences are saved both in the settings and in cookies, and while logged in, the logged-in settings win. (From Fu in #dreamwidth_dev 11 Oct 2011)