I liked JioPages but as you experienced it would lock up on me. Didn’t matter how many times I rebooted it would eventually lockup again. I even uninstalled/reinstalled to no avail.
I settled for TVBRo and like it, but have installed Firefox, but seem to keep forgetting I have it. lol
Also, I highly recommend downloading the Aurora Store and enable it to access the full Play Store. Only negative is you will need something like Mouse Toggle to navigate more efficiently.
Here a fairly neat link.
How to browse internet on Nvidia Shield | TechBytes With Ron Nutter