Deploy Mozilla Firefox 24 ESR with Configuration

I in another Thread/Question I tried deploying Firefox in german language (successfiully). Now I want to add some configuration files to the package.

so the steps should be:

• install Firefox without "Mozilla Maintenance service" using commandline switches and Config Script (unattend.ini)
• copy the config files "local-settings.js", "mozilla.cfg" and "override.ini" to the correct Folder under the Firefox Installation Folder ("C:\Programs\Mozilla Firefox" on 32bit Win 7 or  "C:\Programs (x32)\Mozilla Firefox" on 64bit Win 7)

What I tried:

• Copy the solarwinds package for "Mozilla Firefox 24.5.0 ESR"
• Modified it like the 24.4.0 package, which deploys properly
  • changed Package Title and description
  • changed support url
  • changed Prerequisite Rule (to: Windows Language Language=German)
  • changed Download URL to german firefox installer location
  • changed Binary Langage from English to "English (United States)" --> don't know if neccessary
• Edit package again to add config files and installation modifier
  • added " /INI=unattend.ini" to the "Command Line (silent install)" on the "Select Package" page
  • enabled "Use the Package Boot Helper [...]"
    • removed all default content
    • added under "Before ...":
      • "Terminate firefox.exe" and Continue if this action fails (in test i closed firefox and checked if all firefox processes has been terminated)
      • Stop MozillaMaintenance service and Continue if this action fails
      • Uninstall MSI {B5C3F652-D205-430F-827B-9D4F15FADF30} (the old firefox version) and Continue if this action fails
    • checked "apply package" --> Program name ok (but contains the default spaces), comand-line parameters ok (-ms /ini=unattend.ini)
    • added under "After...":
      • Run cmd.exe --> Run as program with parameters: /c copy %MODULEPATH%\local-settings.js defaults\pref\ and Determine program location from "HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Mozilla Firefox\24.5.0 (de)\Main" Key:"Install Directory" ("32-bit only" checked)
      • Run cmd.exe --> Run as program with parameters: /c copy %MODULEPATH%\override.ini .\ and Determine program location from "HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Mozilla Firefox\24.5.0 (de)\Main" Key:"Install Directory" ("32-bit only" checked)
      • Run cmd.exe --> Run as program with parameters: /c copy %MODULEPATH%\mozilla.cfg .\ and Determine program location from "HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Mozilla Firefox\24.5.0 (de)\Main" Key:"Install Directory" ("32-bit only" checked)
  • enabled "Include additional files [...]"
    • added needed preconfigured files: local-settings.js, mozilla.cfg, override.ini and unattend.ini

Problem:

Mozilla is installed (the Return code says "Failed"), the unattend.ini is NOT used and the files are not copied. What should be modified? And what I have to do to correctly publish the again modified package?