What are these files in my "~/Library/Safari/" folder?

So, I was messing with this folder and while doing this I turned show hidden files on and saw some strange files. These are the names of them, and sizes

.dat8ad4.007 (733K)
.dat011e.000 (704K)
.dat1267.003 (402K)
.dat2eb2.06d (396 Byte)

The top files are hex files, and the last one is some weird encoded text and a link to a youtube channel. What are these files?