Curious about widget security

[prothero at earthlearningsolutions.org]

Given the huge breach with Equifax, I've been thinking about lesser, security issues. Does the browser widget save trackers, cookies, and other marketing type thingies? If so, I wonder if it would be possible to delete them upon closing an app.

What do,you,think?
Bill P

William Prothero
http://es.earthednet.org