Firefox: Even if you regularly clean out your cookies or use a privacy-plus extension like Stealther, Flash videos and other objects leave all kinds of traces on your machine. Until they meet BetterPrivacy, that is.
Billing itself as a "Super-Cookie Safeguard," BetterPrivacy shows you all the controllers and settings left behind by the Flash-based streaming videos, advertisements, and controls that are nearly ubiquitous on the web these days. You can delete them in the same fashion you would make a purging run through your cookies. Then again, you can do that from the Macromedia settings page, right?
Right. So what BetterPrivacy actually improves on is the future handling of your Flash cookies, DOM storage objects, and other browser odds and ends that might give away your procrastination, or other various and sundry web travels. You can set your browser to always wipe clean your Flash cache and DOM objects, but also set a "do not remove" flag for controllers you want to keep around to ensure easy operation in the future. It can be, as the Mozilla page suggests, an "install and forget add-on," and one that provides a little more peace of mind.
BetterPrivacy is a free download, works wherever Firefox does.
BetterPrivacy [Firefox Add-Ons]