More memory

The specs for my Lenovo x140e is 8GB, which I have and it seems to be not enough. $ free                total        used        free      shared buff/cache   available Mem:         7380668     6930852      262676        1492 187140      221144 Swap:       24157176    12044096    12113080 Firefox seems to be a bit part of the problem.   I quit it and see: $ free                total        used        free      shared buff/cache   available Mem:         7380668     5146100     1776840        1364 457728     1948864 Swap:       24157176     5270956    18886220 I am running a VM at 2Gb and a couple of Thunderbird sessions. Closing these TB and waiting a while I drop down to $ free                total        used        free      shared buff/cache   available Mem:         7380668     3751784     1148396       16228 2480488     3272716 Swap:       24157176     2422956    21734220 but really the bottom line is I need more memory for the tasks at hand.  Firefox has all these weird processes running eating up lots of memory and swapping like crazy.  Probably bad for my SSD drive. So how to get to 16GB memory? What follows the x140e in the 12" format?  I can't figure this out from basic Lenovo sales stuff.  Probably going to have to find a Lenovo forum to get the info. But CompuRAM in UK says they can support up to 32GB on the x140e using "newer SO-DIMM chips".  Crucial only sells 4GB for the x140e. Anyone have any knowledge on this?  Other than booting and getting into settings, how do I figure out my bios version?  And to see if Lenovo has a newer one that probably CompuRAM is counting on? Any US memory sources that will support more memory for the x140e? I really don't want to deal with overseas shipping and support. And back to the "newer" hardware question on 140 followon. thanks for any input.  All this swapping is taking time when I really have to wait for the system to bring in what is needed and things to start working.