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Can I modify Firefox config (pref.js) using Powershell

nbaezbiz
nbaezbiz
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I tried to script a PS to make changes to the Pref.js file; however, the changes do not stick? Is this is expected or done by default is there a way that I can modify the file without going to which single system?

PS Script

$TopDir = "$env:APPDATA\Mozilla\Firefox\Profiles" $FileName = 'prefs.js'

$DefaultProfileDir = (Get-ChildItem -LiteralPath $TopDir -Directory). Where({ 

  $_.FullName -match '\.default'
  }).FullName

$FullFileName = Join-Path -Path $DefaultProfileDir -ChildPath $FileName

$Data = foreach($line in Get-Content $FullFileName) { 

if( ($line.IndexOf('network.automatic-ntlm-auth.trusted-uris')) -ne -1)
{
  If ($line.IndexOf('*') -ne -1) {
    $line = $line.replace( '*' , 'abc.com,.abcd.com,.abcde.com')
  }
}
$line

}

$data | Set-Content $FullFileName -Force

I tried to script a PS to make changes to the Pref.js file; however, the changes do not stick? Is this is expected or done by default is there a way that I can modify the file without going to which single system? PS Script $TopDir = "$env:APPDATA\Mozilla\Firefox\Profiles" $FileName = 'prefs.js' $DefaultProfileDir = (Get-ChildItem -LiteralPath $TopDir -Directory). Where({ $_.FullName -match '\.default' }).FullName $FullFileName = Join-Path -Path $DefaultProfileDir -ChildPath $FileName $Data = foreach($line in Get-Content $FullFileName) { if( ($line.IndexOf('network.automatic-ntlm-auth.trusted-uris')) -ne -1) { If ($line.IndexOf('*') -ne -1) { $line = $line.replace( '*' , 'abc.com,.abcd.com,.abcde.com') } } $line } $data | Set-Content $FullFileName -Force

Chosen solution

No need to edit prefs.js as you can do this via a policy.

See Authentication

Read this answer in context 👍 0

All Replies (2)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
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Chosen Solution

No need to edit prefs.js as you can do this via a policy.

See Authentication

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 10 Contributor
more options

Also, while Firefox is open, any changes to prefs.js are likely to be ignored or overwritten. You would need to make changes while Firefox is not running if you wanted to do it this way.