DeletePageTest#deletePageIsImpossibleWhenNoDeleteRights is flickering

org.openqa.selenium.NoSuchElementException: 
Timed out after 10 seconds. Unable to locate the element
For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html
Build info: version: '2.44.0', revision: '76d78cf323ce037c5f92db6c1bba601c2ac43ad8', time: '2014-10-23 13:11:40'
System info: host: 'localhost', ip: '127.0.0.1', os.name: 'Linux', os.arch: 'amd64', os.version: '3.10.40-vs2.3.6.8-beng', java.version: '1.8.0_121'
Driver info: driver.version: unknown
	at org.openqa.selenium.support.pagefactory.AjaxElementLocator.findElement(AjaxElementLocator.java:72)
	at org.openqa.selenium.support.pagefactory.internal.LocatingElementHandler.invoke(LocatingElementHandler.java:37)
	at com.sun.proxy.$Proxy35.click(Unknown Source)
	at org.xwiki.test.ui.po.BasePage.toggleActionMenu(BasePage.java:349)
	at org.xwiki.test.ui.po.BasePage.canDelete(BasePage.java:433)
	at org.xwiki.flamingo.test.ui.DeletePageTest.deletePageIsImpossibleWhenNoDeleteRights(DeletePageTest.java:143)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.xwiki.test.ui.AuthenticationRule$1.evaluate(AuthenticationRule.java:73)
	at org.xwiki.test.ui.browser.BrowserTestRule$1.evaluate(BrowserTestRule.java:104)
	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at com.google.code.tempusfugit.concurrency.IntermittentTestRunner.runChild(IntermittentTestRunner.java:36)
	at com.google.code.tempusfugit.concurrency.IntermittentTestRunner.runChild(IntermittentTestRunner.java:25)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runners.Suite.runChild(Suite.java:128)
	at org.junit.runners.Suite.runChild(Suite.java:27)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.extensions.cpsuite.ClasspathSuite.run(ClasspathSuite.java:194)
	at org.xwiki.test.integration.XWikiExecutorSuite.run(XWikiExecutorSuite.java:195)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
	at org.junit.vintage.engine.execution.RunnerExecutor.execute(RunnerExecutor.java:42)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.Iterator.forEachRemaining(Iterator.java:116)
	at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
	at org.junit.vintage.engine.VintageTestEngine.executeAllChildren(VintageTestEngine.java:83)
	at org.junit.vintage.engine.VintageTestEngine.execute(VintageTestEngine.java:74)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:170)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:154)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90)
	at org.junit.platform.surefire.provider.JUnitPlatformProvider.invokeSingleClass(JUnitPlatformProvider.java:144)
	at org.junit.platform.surefire.provider.JUnitPlatformProvider.invokeAllTests(JUnitPlatformProvider.java:126)
	at org.junit.platform.surefire.provider.JUnitPlatformProvider.invoke(JUnitPlatformProvider.java:105)
	at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:290)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:242)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:121)
Caused by: org.openqa.selenium.NoSuchElementException: Unable to locate element: {"method":"xpath","selector":"//div[@id='tmMoreActions']/a[contains(@role, 'button')]"}
Command duration or timeout: 10.05 seconds
For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html
Build info: version: '2.44.0', revision: '76d78cf323ce037c5f92db6c1bba601c2ac43ad8', time: '2014-10-23 13:11:40'
System info: host: 'localhost', ip: '127.0.0.1', os.name: 'Linux', os.arch: 'amd64', os.version: '3.10.40-vs2.3.6.8-beng', java.version: '1.8.0_121'
Driver info: org.openqa.selenium.firefox.FirefoxDriver
Capabilities [{applicationCacheEnabled=true, rotatable=false, handlesAlerts=true, databaseEnabled=true, version=32.0.1, platform=LINUX, nativeEvents=true, acceptSslCerts=true, webStorageEnabled=true, locationContextEnabled=true, browserName=firefox, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}]
Session ID: 0b9b91b3-2096-48eb-abbf-632a93c56c54
	at sun.reflect.GeneratedConstructorAccessor24.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	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.findElement(RemoteWebDriver.java:352)
	at org.openqa.selenium.remote.RemoteWebDriver.findElementByXPath(RemoteWebDriver.java:449)
	at org.openqa.selenium.By$ByXPath.findElement(By.java:357)
	at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:344)
	at org.xwiki.test.ui.XWikiWebDriver.findElement(XWikiWebDriver.java:581)
	at org.openqa.selenium.support.pagefactory.DefaultElementLocator.findElement(DefaultElementLocator.java:59)
	at org.openqa.selenium.support.pagefactory.AjaxElementLocator.access$001(AjaxElementLocator.java:40)
	at org.openqa.selenium.support.pagefactory.AjaxElementLocator$SlowLoadingElement.isLoaded(AjaxElementLocator.java:140)
	at org.openqa.selenium.support.ui.SlowLoadableComponent.get(SlowLoadableComponent.java:69)
	at org.openqa.selenium.support.pagefactory.AjaxElementLocator.findElement(AjaxElementLocator.java:70)
	... 65 more
Caused by: org.openqa.selenium.NoSuchElementException: Unable to locate element: {"method":"xpath","selector":"//div[@id='tmMoreActions']/a[contains(@role, 'button')]"}
For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html
Build info: version: '2.44.0', revision: '76d78cf323ce037c5f92db6c1bba601c2ac43ad8', time: '2014-10-23 13:11:40'
System info: host: 'localhost', ip: '127.0.0.1', os.name: 'Linux', os.arch: 'amd64', os.version: '3.10.40-vs2.3.6.8-beng', java.version: '1.8.0_121'
Driver info: driver.version: unknown
	at <anonymous class>.FirefoxDriver.prototype.findElementInternal_(file:///tmp/anonymous975709137424468458webdriver-profile/extensions/fxdriver@googlecode.com/components/driver-component.js:9641:133)
	at <anonymous class>.fxdriver.Timer.prototype.setTimeout/<.notify(file:///tmp/anonymous975709137424468458webdriver-profile/extensions/fxdriver@googlecode.com/components/driver-component.js:548:5)