This is one of the many targeting options now available to you. Use this feature to show your ads to the target audience based on the browser that they are using.
How to Apply?
This targeting option is available at the ad group level.
1. Select the Ad Group to Apply
Under the Campaigns menu, select a campaign and click on the ad group that you wish to apply this browser targeting.
2. Add Browser Targeting
Under the sidebar, click Technology. It is one of the many targeting options available when setting up an ad group.
Click on Add Browsers button and select the browser(s) that you would like to target.