Hi,

I am writing a piece of code to capture the traffic of a specific link.
I followed the link 
http://www.softwareishard.com/blog/firebug/automate-page-load-performance-testing-with-firebug-and-selenium/
and it works perfectly on my local mac.

Here is my preference code:

val profile = new FirefoxProfile()

profile.addExtension(firebugFile)
val FBDomain = "extensions.firebug."
profile.setPreference(s"${FBDomain}currentVersion", "2.0.3")
profile.setPreference(s"${FBDomain}allPagesActivation", "on")
profile.setPreference(s"${FBDomain}defaultPanelName", "net")
profile.setPreference(s"${FBDomain}net.enableSites", true)

profile.addExtension(netExportFile)
val NEDomin = "netexport."

profile.setPreference(s"${FBDomain}${NEDomin}defaultLogDir", logDir.
getCanonicalPath)
profile.setPreference(s"${FBDomain}${NEDomin}alwaysEnableAutoExport", true)
profile.setPreference(s"${FBDomain}${NEDomin}showPreview", false)
profile.setPreference(s"${FBDomain}${NEDomin}autoExportToFile", true)
profile.setPreference(s"${FBDomain}${NEDomin}saveFiles", true)

//firefox preference
profile.setPreference("app.update.enable", false)

System.setProperty("webdriver.firefox.logfile", s
"${firefoxLogDir.getCanonicalPath}/FFError.log")
System.setProperty("webdriver.logfile", s
"${firefoxLogDir.getCanonicalPath}/FFjsConsole.log")

new FireFoxDriver(profile)




However, when I deploy it to my QA box which is ubuntu 12.04.3 LTS, HAR 
stopped being produced.

Here's my specific:
Selenium-java 2.42.2
Firefox 29 ( was Firefox 31 on my laptop)
Firebug 2.0.3
netExport 0.9b6

I use xvfb-run to allow headless browser to run
The only Firefox error to capture after I supplied the 
webdriver.firefox.log:
==========================================
Xlib:  extension "RANDR" missing on display ":98".
*** LOG addons.xpi: startup 
*** LOG addons.xpi: Ignoring file entry whose name is not a valid add-on ID: 
/tmp/anonymous9058616010009053829webdriver-profile/extensions/webdriver-staging 

*** LOG addons.xpi: checkForChanges 
*** LOG addons.xpi: No changes found 

(firefox:17859): LIBDBUSMENU-GLIB-WARNING **: Unable to get session bus: 
Error spawning command line `dbus-launch 
--autolaunch=3c2808eefd0e7456cb17e781000000c3 --binary-syntax 
--close-stderr': Failed to execute child process "dbus-launch" (No such 
file or directory) 
*** Blocklist::_loadBlocklistFromFile: blocklist is disabled 
Xlib:  extension "RANDR" missi*** Blocklist::_loadBlocklistFromFile: 
blocklist is disabled 
Xlib:  extension "RANDR" missing on display ":98". 
JavaScript error: , line 0: Permission denied to access property 'toString' 
============================================

Can any shed some light out?

many thanks!
Victor

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