By Jeremy Hill | for Technology Tell Earlier this year, Amazon turned on a new service for its Kindle Fire HD tablets called FreeTime. FreeTime is a kid-friendly interface that allows parents to pick and choose which apps, videos and web content their kids can access. On Tuesday, Amazon announced its plans to automate the service with something it calls Kindle FreeTime Unlimited. Unlike the regular version of FreeTime, FreeTime Unlimited will cost Amazon Prime subscribers $2.99 per month for each child, or $6.99 for a family subscription. If you aren’t a Prime member, the price jumps to $4.99 and $9.99 respectively. For...