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Clicking the Options button opens this dialog box, where you can see that Skype was about to install add-ons to both Internet Explorer and Chrome. These add-ons can cause your browser to crash, can slow down the opening of page, and change the appearance of phone numbers on web pages. Most people don't want or need these things, and yet Skype installs them automatically.
For more details, see "Adobe and Skype top my Foistware Hall of Shame."