After deploying Firefox 45 ESR, some machines are throwing an error on first 
run “Installer corrupted: invalid opcode” and I noticed some GUI issues on 
them.  I discovered that uninstalling Firefox with the helper.exe prior to 
deploying prevented those issues.

I wanted to dig deeper and find what exactly was causing this.  So instead of 
using helper.exe, I deleted:

  *   %ProgramFiles(x86)%\Mozilla Firefox
  *   %UserProfile%\AppData\Local\Mozilla
  *   %UserProfile%\AppData\Roaming\Mozilla
  *   HKLM\Software\Mozilla
  *   HKLM\Software\MozillaPlugins
  *   HKCU\Software\Mozilla
  *   HKCU\Software\MozillaPlugins

But still the same issues!  So what else is helper.exe doing?

--
Jason Jackson
Computer System Technician
North Vancouver School District
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