Environment::getExtConf() 

\nn\t3::Environment()->getExtConf($ext = 'nnhelpers', $param = ''); 

Get configuration from ext_conf_template.txt (backend, extension configuration)

\nn\t3::Environment()->getExtConf('nnhelpers', 'varname');
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Also exists as ViewHelper:

{nnt3:ts.extConf(path:'nnhelper')}
{nnt3:ts.extConf(path:'nnhelper.varname')}
{nnt3:ts.extConf(path:'nnhelper', key:'varname')}
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| @return mixed

Source Code 

public function getExtConf ( $ext = 'nnhelpers', $param = '' ) {
	$extConfig = $GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS'][$ext] ?? [];
	return $param ? ($extConfig[$param] ?? '') : $extConfig;
}
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