Hi btty92,

Do you know what Android version you are running on your tablet?

These are the steps that I use on my Galaxy phone, which should be very similar:

1. Go into Settings and then tap on Apps.
2. Go to the "All" tab to list all your apps.
3. Tap on the "Browser" app (assuming this is the app that is opening by default when you open a link)
4. Tap on "Clear defaults".

Now, the next time you click on a link, you will be prompted to choose an app to open the link. You can choose Firefox, and select the option to "Always" open links using this app.

I hope this helps!

- Ralph