I am still using internet explorer from yrs ago when I got my X30 in '04.
1)How do I know what explorer version I have?
2)How do I update to current version or Mozilla?
The only way to update PIE is through ROM upgrades. PIE is part of the operating system. Check your ROM version compared to the one for your model at Dell's site to determine if you need a ROM upgrade. You can download and install minimo if you'd like to use Mozilla. I found minimo to be very slow compared to PIE.