i never used any toolbar of any security product. chrome extensions work different from firefox or opera. nevertheless some chrome extensions have also stopped working in the past after update or became buggy. one to mention for kaspersky vs firefox - kaspersky has 18 weeks to get along with new builds: 6/nightly - 6/aurora - 6/beta (in beta there were never big changes). similar for chrome and opera. although a descent and nearly proper working product (i never had really trouble while testing). but eset has same from time to time with the thunderbird extension - avast with webrep aso.