Alright, let's get started with Firebase-tools. It's a handy command line tool that helps you manage your Firebase apps. First things first, make sure you have Node.js and npm installed on your computer. Once that's sorted, pop open your terminal and type in:

npm install -g firebase-tools

If you run into any permission issues, don't worry. Just add sudo at the beginning like this:

sudo npm install -g firebase-tools

Now, head over to your project's root directory in the terminal and type:

firebase login

This will ask you to log in with your Google account. Go ahead and do that.

Next up, initialize your Firebase project by running:

firebase init

You'll be asked to pick the Firebase CLI features you want to set up for your project. For now, select "Hosting".

Time to link your app with Firebase. You can either choose an existing Firebase project or create a new one. After that, pick a public directory to be the root of your hosted site. For most Progressive Web Apps (PWAs), the "build" folder is a good choice.

When asked if you want to set the app to single-page mode, say "yes". This lets Firebase rewrite all requests to index.html, so your app's routing can handle them properly.

Finally, Firebase will ask if you want to deploy your project. You can always deploy later with this command:

firebase deploy

Before deploying your app, make sure to build it first. If you're using React, the build command is:

npm run build

Once you're happy with the build, deploy it using:

firebase deploy

Firebase will give you a URL where you can access your hosted PWA.

And there you have it! Your PWA is now live on Firebase.