You can remove interest categories Google has attributed to you or add others by visiting its Ad Preferences page. You can also opt out. To make the opt-out setting permanent, however, you'll need to install a plug-in for each browser you use. It's available for IE, Firefox, Chrome and Safari.
6. Add SSL to Gmail. You can encrypt e-mails you read and create in Gmail. Your log-in data is encrypted by default by SSL encryption, but SSL is turned off when you interact with your e-mail, because it can slow performance.
You'll find the option in Settings under the General tab. Scroll to the bottom of the screen and select the "Always use https" option under the Browser Connection setting.
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