With extensions you can customize and add more features to Google Chrome browser, if you installed too many extensions for Chrome and trying to troubleshoot which add-on is causing crashes or to disable all Chrome extensions at once intentionally you can use Disable All Extensions Plus Chrome extension.

disable all chrome extensions with a single click

After installing this extension its icon appears on Chrome toolbar. Clicking the icon shows drop down menu with list of options to disable all extensions, left click to disable and right click to uninstall an extension.

Disable All Extensions Plus