Makes the web seem much safer. Keeps spam from happening related to a visited page. For example when I checked a Bank's interest rate, the next day I would get emails offering differing interest offers from other banks. I had to make multiple rules every day, must have 50 or more such rules. Takes Thunderbird 5 minutes to delete those email during which the program is not responsive Yes, need a new address, but have many interests, takes forever to go to the sites, change that email address