Selenium can't start Firefox, what could be the problem?

Question

selenium

Xvfb is started with the following options:

/usr/bin/Xvfb :99 -ac -screen 0 1920x1080x8 -extension RANDR &

If you type in the console DISPLAY=:99 firefox, and then connect via VNC, you can see that FF starts normally. The only thing is that it does not respond to pressing buttons on the keyboard, I don’t know how normal this is.
Selenium is started like this:

export DISPLAY=:99
java -jar /var/lib/selenium/selenium-server-standalone.jar -Dwebdriver.firefox.bin="/usr/local/bin/firefox" -port 4444

Selenium cheerfully reports about the start. After that, if we start the session through /wd/hub, we see the following Exception:

09:12:53.241 INFO - Executing: [new session: Capabilities [{browserName=firefox}]])
09:12:53.256 INFO - Creating a new session for Capabilities [{browserName=firefox}]
09:12:57.142 WARN - Exception thrown
java.util.concurrent.ExecutionException: org.openqa.selenium.WebDriverException: java.lang.reflect.InvocationTargetException
Build info: version: '2.44.0', revision: '76d78cf', time: '2014-10-23 20:02:37'
System info: host: '184691-2.vm.clodoserver.ru', ip: '62.76.40.65', os.name: 'Linux', os.arch: 'amd64', os.version: '2.6.32.26', java.version: '1.6.0_32'
Driver info: driver.version: unknown
        at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252)
        at java.util.concurrent.FutureTask.get(FutureTask.java:111)
        at org.openqa.selenium.remote.server.DefaultSession.execute(DefaultSession.java:175)
        at org.openqa.selenium.remote.server.DefaultSession.<init>(DefaultSession.java:111)
        at org.openqa.selenium.remote.server.DefaultSession.createSession(DefaultSession.java:88)
        at org.openqa.selenium.remote.server.DefaultDriverSessions.newSession(DefaultDriverSessions.java:108)
        at org.openqa.selenium.remote.server.handler.NewSession.handle(NewSession.java:57)
        at org.openqa.selenium.remote.server.handler.NewSession.handle(NewSession.java:1)
        at org.openqa.selenium.remote.server.rest.ResultConfig.handle(ResultConfig.java:112)
        at org.openqa.selenium.remote.server.JsonHttpCommandHandler.handleRequest(JsonHttpCommandHandler.java:172)
        at org.openqa.selenium.remote.server.DriverServlet.handleRequest(DriverServlet.java:201)
        at org.openqa.selenium.remote.server.DriverServlet.doPost(DriverServlet.java:163)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
        at org.openqa.selenium.remote.server.DriverServlet.service(DriverServlet.java:129)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at org.openqa.jetty.jetty.servlet.ServletHolder.handle(ServletHolder.java:428)
        at org.openqa.jetty.jetty.servlet.ServletHandler.dispatch(ServletHandler.java:680)
        at org.openqa.jetty.jetty.servlet.ServletHandler.handle(ServletHandler.java:571)
        at org.openqa.jetty.http.HttpContext.handle(HttpContext.java:1526)
        at org.openqa.jetty.http.HttpContext.handle(HttpContext.java:1479)
        at org.openqa.jetty.http.HttpServer.service(HttpServer.java:920)
        at org.openqa.jetty.http.HttpConnection.service(HttpConnection.java:820)
        at org.openqa.jetty.http.HttpConnection.handleNext(HttpConnection.java:986)
        at org.openqa.jetty.http.HttpConnection.handle(HttpConnection.java:837)
        at org.openqa.jetty.http.SocketListener.handleConnection(SocketListener.java:243)
        at org.openqa.jetty.util.ThreadedServer.handle(ThreadedServer.java:358)
        at org.openqa.jetty.util.ThreadPool$PoolThread.run(ThreadPool.java:537)
Caused by: org.openqa.selenium.WebDriverException: java.lang.reflect.InvocationTargetException
Build info: version: '2.44.0', revision: '76d78cf', time: '2014-10-23 20:02:37'
System info: host: '184691-2.vm.clodoserver.ru', ip: '62.76.40.65', os.name: 'Linux', os.arch: 'amd64', os.version: '2.6.32.26', java.version: '1.6.0_32'
Driver info: driver.version: unknown
        at org.openqa.selenium.remote.server.DefaultDriverProvider.callConstructor(DefaultDriverProvider.java:69)
        at org.openqa.selenium.remote.server.DefaultDriverProvider.newInstance(DefaultDriverProvider.java:53)
        at org.openqa.selenium.remote.server.DefaultDriverFactory.newInstance(DefaultDriverFactory.java:54)
        at org.openqa.selenium.remote.server.DefaultSession$BrowserCreator.call(DefaultSession.java:214)
        at org.openqa.selenium.remote.server.DefaultSession$BrowserCreator.call(DefaultSession.java:1)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at org.openqa.selenium.remote.server.DefaultSession$1.run(DefaultSession.java:168)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:701)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:534)
        at org.openqa.selenium.remote.server.DefaultDriverProvider.callConstructor(DefaultDriverProvider.java:59)
        ... 10 more
Caused by: org.openqa.selenium.UnsupportedCommandException: Bad request
Command duration or timeout: 389 milliseconds
Build info: version: '2.44.0', revision: '76d78cf', time: '2014-10-23 20:02:37'
System info: host: '184691-2.vm.clodoserver.ru', ip: '62.76.40.65', os.name: 'Linux', os.arch: 'amd64', os.version: '2.6.32.26', java.version: '1.6.0_32'
Driver info: org.openqa.selenium.firefox.FirefoxDriver
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:534)
        at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:204)
        at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:156)
        at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:599)
        at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:240)
        at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:126)
        at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:193)
        at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:186)
        at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:104)
        ... 15 more
09:12:57.150 WARN - Exception: Bad request
Command duration or timeout: 389 milliseconds

At the same time, when connecting via VNC, it is clear that the FF window flickers and immediately dies.
Actually, the question is as simple as a stool: CHYADNT?