I used to get that kind of indication from this and some other web sites until I made it a habit of clearing all cookies and closing the browser between using this site and going to another. I also started using a cleaner after this web site. I discovered that although this and other sites say they have cleared all cookies, in fact, they do not. Plus, lots of garbage accumulates in the cache.
Based on prior experience I chose not to use any kind of a White List Exception for any site.
Once I started doing these fairly simple things no more problems.