Updated this morning, no problems so far.
One thing I have recognized this morning is battery life issues. Apparently when FF18 updated it turned off Juice Defender Ultimate, but since I am don't get out much I didn't notice battery life until I downloaded another battery program (Battery, I also have Battery Widget too) as a whim and found I only had 2-3 hours of battery life indicated. I then realized I had brightness turned all the way up, so I lowered to 50%, checked and Battery program jumped to 5-6 hours of life. I then check usage and the screen was taking up 70% of battery, now 21%. Needless to say it could be usage differences, but I believe my usage is the same. One big difference is realizing Juice Defender Ultimate had been turned off during FF18 update a few weeks ago. I turned it back on to "Balanced" settings and another big difference with battery usage, now the Battery program tells me I have 4+ days of juice on one charge.
Maybe the reason I wasn't having the dreaded battery problems before is Juice Defender, its pretty cool and turns things off and on automatically when it thinks I need them. Like hitting a program that needs Wifi, it automatically shuts down Wifi, 3g and 4g if you don't need them or if connected to Wifi, it always shuts 3g and 4g down. When I leave the house it automatically turns Wifi off (it even learns to recognize my networks I attached to automatically) and turns radios back on. I think it will auto off 4g if it doesn't get reception. One more thing, when the screen goes dark (no usage), JD shuts a lot of things down until the screen wakes up and then it turns things back on automatically.
Hope this helps, JD is a big help and at $9.95 (special deal?) its worth the price versus the big battery or carrying a spare (I do that anyway). Now to read more on what FH 13 does.