Can i delet the files in this folder?

My C drive is running out of space and there are alot of files here that are taking up alot of space. I will sacrefice good internet experience in order to open up some space on my C; drive.

many of the files are called something along the lines of;
~DF9DDF.tmp
~DF1BB2.tmp
etc...

what is an .xpi file? can I delete temp files w/o screwing up existing programs and documents on my computer\?

Well MS advises that to gain more memory...

Deleting old temporary files from your hard disk. Temporary files have a .tmp file name extension, or names that begin with a tilde (~), and are usually found in the C:\Temp or C:\Windows\Temp folder.

And a .xpi is a Mozilla/Firefox Browser Extension Archive.

i dont think you'll have a problem emptying those files out. Why would they name it temp if you couldn't delete it right? i guess you never know with windows tho

No problem at all untill some program is using some file of those, but is completly secure to delete them.