diff --git a/App Install or Upgrade Scripts/App - Firefox - Install or Upgrade.ps1 b/App Install or Upgrade Scripts/App - Firefox - Install or Upgrade.ps1
new file mode 100644
index 0000000..5a032f9
--- /dev/null
+++ b/App Install or Upgrade Scripts/App - Firefox - Install or Upgrade.ps1	
@@ -0,0 +1,63 @@
+<#
+Author: Gabe Kerntke
+Date: 08-19-2024
+
+.Synopsis
+Script to install Firefox on machines that do not already have it or upgrade to the newest version if behind
+
+.Modified
+2024-08-19 (GabeK) - Original script created
+2025-05-02 (GabeK) - Rebuilt to use functions script
+#>
+
+[CmdletBinding()]
+Param(
+    [Parameter(Mandatory = $false)]
+    $App_Name = "Firefox",
+    [Parameter(Mandatory = $false)]
+    $File_Name_Prefix = "Firefox-x64",
+    [Parameter(Mandatory = $false)]
+    $File_Name_Extension = "exe",
+    [Parameter(Mandatory = $false)]
+    $Install_Parameters = "/S",
+    [Parameter(Mandatory = $false)]
+    $EPCache_Folder = "3rd Party Patches\$App_Name",
+    [Parameter(Mandatory = $false)]
+    $Version_URL = '(Invoke-WebRequest -UseBasicParsing "https://product-details.mozilla.org/1.0/firefox_versions.json").Content | ConvertFrom-Json',
+    [Parameter(Mandatory = $false)]
+    $Online_Version = $Version_URL.LATEST_FIREFOX_VERSION,
+    [Parameter(Mandatory = $false)]
+    $FirefoxURL = (Invoke-WebRequest -UseBasicParsing "https://download-installer.cdn.mozilla.net/pub/firefox/releases/$Online_Version/win64/en-US/").Links.href -like "*exe*",
+    [Parameter(Mandatory = $false)]
+    $DownloadURL = "https://download-installer.cdn.mozilla.net$FirefoxURL",
+    [Parameter(Mandatory = $false)]
+    $File_Name = "$File_Name_Prefix-$Online_Version.$File_Name_Extension"
+)
+
+#Region Script Start
+If ((Test-Path "C:\Temp\Script Cache") -eq $False) { New-Item -ItemType directory -Path "C:\Temp\Script Cache" }
+Invoke-WebRequest -UseBasicParsing "https://scripts.gabesville.com/Gabesville/Powershell-Scripts/raw/branch/main/Functions%20Scripts/Functions.ps1" -outfile "C:\Temp\Script Cache\Functions.ps1"
+. "C:\Temp\Script Cache\Functions.ps1"
+
+#Check to see if program is installed
+$Applist = Get-Software | Sort-Object -Descending
+
+If ($Applist.DisplayName -like "*$App_Name*") { 
+
+    #Get currently installed version 
+    $Local_Version = Get-Software | Where-Object { $_.DisplayName -like "*$App_Name*" } | Select-Object -ExpandProperty DisplayVersion
+    
+    #Comparing version already installed to what is online
+    If ($Local_Version -lt $Online_Version) {
+        Test-Probe_Online
+        Close-App
+        Install-App
+    }
+    Else { Write-Host "$App_Name already on latest version (Installed version: $Local_Version)" }
+}
+
+Else {
+    Test-Probe_Online
+    Install-App
+}
+#Region Script End
\ No newline at end of file