Pop-ups, such as windows that open to provide a return shipping label, and web browser addons, like the Google toolbar, can make browsing more fun or more effective, but sometimes they can slow down your computer or cause the browser to shut down unexpectedly. Most addons require user consent before they are downloaded, but some might be downloaded without your knowledge and some may be tracking your browsing habits. How do you know which add-ons are running on your computer? Explore the settings for your browser to see how you can configure them. How do you allow some popcontent ups and disallow others? Review your add-ons. Which ones are allowed on your browser? What specific functionality does each provide? Did you disable any add-ons? Which ones, and why?