for best viewing, go Large.
I was running Firefox with many (too) many tabs for the computer to handle, including large Flickr photographs. Then, a Google cache search result tab became the conduit for the glitches, pulling images from the Firefox cache, while the other tabs remained stable enough to allow browsing more pages. As I switched back to the Google cache tab, the previous tab's displayed content would automatically glitch. It was fun while it lasted (a few hours).
thanks to chrunk!
a script has been made by t.koyachi inspired by this set which duplicates some of its properties.