Because tagging this post tracking carries an implicit accusation, let me address this part.
wb: values, which actually result from Winter Bash, just contain cached results of HTTP API calls (who is wearing what hat etc.). There is no tracking going on. We figured that you don't have to download the same data on every single page view, saving both you and us bandwidth. This has nothing whatsoever to do with tracking. It's a cache.
If you (or anyone) still doesn't believe me, just run
As a side note, any "cookie cleaner" worth its salt should clear localStorage as well, and all browsers have such functionality built-in.