For FIREFOX:
- Click on the Tools pull-down menu.
- Select Add-Ons.
- Select Extensions.
- Select Disable under the Alexa Toolbar.
For GOOGLE CHROME:
You can Disable the Alexa Traffic Rank extension for Chrome. That will remove it from the browser’s chrome.
- Click on the Customize Chrome button (the wrench)
- Select Tools to bring up the scroll-over menu
- Click on Extensions
- Click on the ‘Enable’ checkbox