Look for a rectangular box that says 'An extension,, is controlling this setting.

See the settings that an extension changed

On to the extension you want to remove, click Remove.

At the top right, click More More tools Extensions.

When you remove the extension your settings will go back to how they were before you installed it. You can't use the extension without letting it change your settings. If you don't want your settings changed, uninstall or disable the extension.

Tip: Before you install an extension, check which Chrome settings the extension changes. If an extension changes your new tab page and default search engine, you'll be asked to confirm you changed your search engine on purpose. The extension can also scan your computer for viruses and clean up your hard drive of unused applications helping your computer run faster as a result.

Changes can affect settings such as your homepage, new tab page, search engine, or start page. The Click&Clean extension for Chrome allows you to clear your cache, URL searches, website cookies, and download history with a single click of a button on your browser toolbar. Most changes enhance your browsing experience and make using the extension easier. With your permission, extensions you install from the Chrome Web Store can make changes to your Chrome settings. This article applies to Chrome for Windows and Mac only.

Google chrome web store extensions