Map Pro Cylinder El Capitan OS X 10.11.6, Safari keeps crashing when I open it.

From the article Carolyn posted a link to.

Remove Internet plug-ins and other add-ons

You can remove Internet plug-ins and other add-ons to learn whether any are causing the issue. To find them, quit Safari and open these Library folders:

• The Library folder at the top level of your hard drive. Open it from the Finder by choosing Go > Go to Folder from the menu bar. Then type

  /Library

  and click Go.
• The Library folder in your home folder. Open it by holding Option while choosing Go > Library from the menu bar.

The Library folders contain the following folders for add-ons. Move any files within these folders to the Trash.

• Internet Plug-Ins
  Don't remove Default Browser.plugin, nslQTScriptablePlugin.xpt, Quartz Composer.webplugin, or QuickTime Plugin.plugin.
• Input Methods
• InputManagers
• ScriptingAdditions

If removing the files from these folders resolves the issue, quit Safari again and gradually put back files until you find the one causing the issue:

1. Open the Trash and select one of the files you removed. Chose File > Put Back. The file returns to its folder.
2. Open Safari and see if the issue returns.
   • If the issue returns, you've identified the add-on causing the issue. Avoid using it or contact its maker for an updated version.
   • If the issue doesn't return, quit Safari and put back another file.

You can remove Internet plug-ins and other add-ons without launching Safari ...

Instructions > If Safari is slow, stops responding, quits unexpectedly, or has other issues - Apple Support

Hi,

Troubleshooting help here > If Safari is slow, stops responding, quits unexpectedly, or has other issues - Apple Support