In ubuntu firefox does not start

[Build info]
build number: 1267
version name: JetBrains MPS Beta
build date: Wed Dec 03 00:00:00 MSK 2008



Cannot run program "mozilla": java.io.IOException: error=2, No such file or directory
java.io.IOException: Cannot run program "mozilla": java.io.IOException: error=2, No such file or directory
 at java.lang.ProcessBuilder.start(ProcessBuilder.java:474)
 at java.lang.Runtime.exec(Runtime.java:610)
 at java.lang.Runtime.exec(Runtime.java:483)
 at jetbrains.mps.ide.browser.BrowserUtil.launchBrowser(BrowserUtil.java:36)
 at jetbrains.mps.workbench.actions.help.ShowSiteAction.doExecute(ShowSiteAction.java:29)
 at jetbrains.mps.workbench.action.BaseAction$3.run(BaseAction.java:119)
 at jetbrains.mps.smodel.ModelAccess$9.compute(ModelAccess.java:264)
 at jetbrains.mps.smodel.ModelAccess$4.compute(ModelAccess.java:107)
 at com.intellij.openapi.application.impl.ApplicationImpl$12.run(ApplicationImpl.java:762)
 at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:743)
 at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:760)
 at jetbrains.mps.smodel.ModelAccess.runWriteAction(ModelAccess.java:114)
 at jetbrains.mps.smodel.ModelAccess$8.run(ModelAccess.java:251)
 at com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(CommandProcessorImpl.java:94)
 at com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(CommandProcessorImpl.java:71)
 at jetbrains.mps.smodel.ModelAccess.runWriteActionInCommand(ModelAccess.java:249)
 at jetbrains.mps.smodel.ModelAccess.runWriteActionInCommand(ModelAccess.java:262)
 at jetbrains.mps.smodel.ModelAccess.runWriteActionInCommand(ModelAccess.java:258)
 at jetbrains.mps.workbench.action.BaseAction.actionPerformed(BaseAction.java:117)
 at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:167)
 at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2012)
 at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:58)
 at com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:481)
 at com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:28)
 at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:501)
 at java.awt.Component.processMouseEvent(Component.java:6108)
 at javax.swing.JComponent.processMouseEvent(JComponent.java:3276)
 at java.awt.Component.processEvent(Component.java:5873)
 at java.awt.Container.processEvent(Container.java:2105)
 at java.awt.Component.dispatchEventImpl(Component.java:4469)
 at java.awt.Container.dispatchEventImpl(Container.java:2163)
 at java.awt.Component.dispatchEvent(Component.java:4295)
 at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4461)
 at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4125)
 at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4055)
 at java.awt.Container.dispatchEventImpl(Container.java:2149)
 at java.awt.Window.dispatchEventImpl(Window.java:2478)
 at java.awt.Component.dispatchEvent(Component.java:4295)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:604)
 at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:472)
 at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:461)
 at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:337)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)
Caused by: java.io.IOException: java.io.IOException: error=2, No such file or directory
 at java.lang.UNIXProcess.<init>(UNIXProcess.java:164)
 at java.lang.ProcessImpl.start(ProcessImpl.java:81)
 at java.lang.ProcessBuilder.start(ProcessBuilder.java:467)
 ... 47 more