UPDATE: Brewer's Edge has now made this built-in functionality on their site, so the extension is no longer needed.
This extension adds a row to the Hop Summary table on Brewer's Friend recipes that shows the total amount of hops used in the recipe, similar to what the site already does with grains.
Update 1.2.3: You can now set which unit you would like your hop totals to be displayed in through the extension options (choice of grams, oz, lb, or kg)
Link to source: https://github.com/damemi/hoptotal
Note: This extension is unofficial and in no way affiliated with Brewer's Friend