For those of you worrying about leaving "tracks"in your employer issued computer may I suggest PortableApps.
https://en.wikipedia.org/wiki/PortableApps.comYou simply need one of the following: a memory stick/thumb drive, memory card and reader, external hard drive, Dropbox account, or just a folder on your computer.
If you go with a folder you can put all the files in that one folder and then "nuke" it in case anyone comes around snooping. Gone will be all your files. They would still be recoverable if someone was that interested so don't store "secrets" in those folders.
At previous jobs where I worried about someone looking over my shoulder so to speak - looking to see what I had bookmarked or the browser history files - using portable browsers (Opera, Firefox, etc) was the ticket. Also on that memory stick was my chat program of choice back then, email program, media player, podcast manager, etc.
I also added a number of utility programs that I relied on to automate my tasks at a previous job. When I went home the memory stick went with me and so did my methods. If I was fired or laid off, the techniques I had developed to make myself more efficient would go with me.
In fact the computer automation did go with me b/c that employer was a bit patronizing to me again when I gave my notice. They made a number of empty promises (again) in order to get me to stay but I left anyhow. Green pastures for certain at the next job.
Add some extensions to your portable browsers like EFF's Badger and HTTPS Everywhere plus AdBlockPlus. TOR might work but it might also attract alot of attention by the IT department. It would hide what websites you were visiting anyhow.
PortableApps creates a pseudo laptop on a memory stick (thumb drive) that carries all your files and software with you. It sets up folders on the memory stick for everything (docs, pictures, music, videos plus you can add any of your own).
With the giant capacity memory sticks available these days you can carry all your favorite PDFs, podcasts, music collection, etc to minimize what you are connecting to or downloading via your office computer.
I once got dinged at a previous job b/c my downloads were noticeably higher than my coworker's. I was an engineer, not IT but I was teaching myself Linux and downloading a different ISO file of ~700MB every few days as I tip-toed through the various distros. MUCH faster to do that at work than at home where I had still had dialup. ;)
I blamed the data consumption on podcasts, streaming music (Radio Paradise), PDF catalog downloads directly related to my job, etc.
I had automated much of my job and needed to stay awake/interested and I did it in the same ways everyone else has described. Learning new skills, reading websites, etc. Linux helped me get my next job which included a smattering of IT support and coaching of coworkers on IT matters.
I think we (MMM) ought to all combine forces and create one company. I think a company built with MMM participants would be unstoppable. ;)