Win 7 and FireFox is running in German language. Win 7 has all available updates installed. Same for 32 and 64 Bit GeckoDriver! (my Win 7 ist 64 Bit; my FireFox is 32 Bit). Is this just a problem on my PC ?
driver.quit() is working on my InternetExplorer without a problem.
package JS_JFrame1;                                       
import org.openqa.selenium.WebDriver;                     
import org.openqa.selenium.firefox.FirefoxDriver;        
public class SeleniumFireFoxMinimal1 {  
public static void main(String[] args) throws InterruptedException {
    System.setProperty("webdriver.gecko.driver", "e:\\geckodriver.exe");
    WebDriver driver = new FirefoxDriver();                 
    driver.get("http://www.toolsqa.com");                    
    Thread.sleep(5000);                                   
    driver.quit();                                        
    }
}
Other Selenium commands like these work perfectly well:
element = driver.findElement(By.id("sinp"));              
System.out.println( "Element found!");                   
element.clear();                                                
element.sendKeys("black");                                      
element.submit();                                                       
Eclipse Console-Output:
1488978842009 addons.manager DEBUG Completed startup sequence 1488978842565 Marionette INFO Listening on port 52628 1488978843470 addons.manager DEBUG Starting provider: 1488978843470 addons.manager DEBUG Registering shutdown blocker for 1488978843471 addons.manager DEBUG Provider finished startup: 1488978843514 addons.manager DEBUG Starting provider: PreviousExperimentProvider 1488978843515 addons.manager DEBUG Registering shutdown blocker for PreviousExperimentProvider 1488978843515 addons.manager DEBUG Provider finished startup: PreviousExperimentProvider 1488978843519 DeferredSave.extensions.json DEBUG Starting write 1488978843910 DeferredSave.extensions.json DEBUG Write succeeded 1488978843910 addons.xpi-utils DEBUG XPI Database saved, setting schema version preference to 19 Mär 08, 2017 2:14:06 PM org.openqa.selenium.remote.ProtocolHandshake createSession INFORMATION: Detected dialect: W3C 1488978859017 Marionette INFO New connections will no longer be accepted [Child 6128] ###!!! ABORT: Aborting on channel error.: file c:/builds/moz2_slave/m-rel-w32-00000000000000000000/build/src/ipc/glue/MessageChannel.cpp, line 2143 Mär 08, 2017 2:14:20 PM org.openqa.selenium.os.UnixProcess destroy SCHWERWIEGEND: Unable to kill process with PID 4732
Hardcopy of the FireFox-Crash-Popup:
https://www.dropbox.com/s/f3cuklcsgdbqcyx/FireFox_52_CrashPopup.PNG?dl=0
Report at GitHub: