npm i -g firebase-tools leads to …firebase.ps1 cannot be loaded because running scripts is disabled on this system

The error is due to Windows blocking access to run the firebase.ps1 powershell scripts. You can try the below commands to solve the issue,

Code:

Solution 1:
Set-ExecutionPolicy RemoteSigned

For current users,
Set-ExecutionPolicy RemoteSigned -Scope CurrentUser

Solution 2:
npm cache clean --force

Solution 3:
C:\Users{username}\AppData\Roaming\npm\firebase.ps1
You can delete this file and try again.

RemoteSigned: This requires that all scripts and configuration files downloaded from the Internet are signed by a trusted publisher. The default execution policy for Windows server computers.