How to Stop Ads in Google Mail

1. Visit the Webmail Ad Block add-on page for either Firefox or Chrome: https://addons.mozilla.org/en-us/firefox/addon/webmail-ad-blocker/orhttps://chrome.google.com/extensions/detail/cbhfdchmklhpcngcgjmpdbjakdggkkjp
2. Click the 'Add to Firefox' button on Firefox or 'Install' button on Chrome.

3. Click the 'Install Now' button after the dialog box appears. Firefox requires a browser restart but Chrome does not.
4. Sign in to your Google Mail account and open an email. You will notice the text ads on the right side no longer exist. The add-on removes the ads and extends the message to fill the screen.