…from: https://support.apple.com/en-us/ht206594 If MacBook Pro (Retina, 13-inch, Early 2015) becomes unresponsive when a web browser is running
Install the latest updates for OS X and the Adobe Flash Player web plug-in.
If your MacBook Pro (Retina, 13-inch, Early 2015) stops responding when Safari or another web browser is running, make sure that your software is up to date:
1. Use the Mac App Storehttps://support.apple.com/kb/HT201541 to find and install any updates for OS X and other software. 2. If you're using the Adobe Flash Player web plug-in, make sure that you have the latest version. Contact Adobe if you need help downloading, installing, or using Adobe Flash Player.
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Last Modified: Jun 3, 2016