Email

Read the Original Message (OM) in Gmail without rendering any HTML elements

1. Set the ui to html: https://mail.google.com/?ui=html

2. Right click your target email, click Copy Link Location

3. Change the ending of the copied url from v=c to v=om

4. Visit the modified url

Alternatively, if rendered-or-not doesn't matter, just select the OM option from the options within the email: