It intercepts traffic, finds supported resources locally, and injects them into the environment.Isn't that what your browser cache is supposed to do?
Speaking of cache and chrome extensions, is there a good alternative to WayBack for downloading those no longer published? When I try to disable auto refresh in Chrome all the articles specify installing Auto Refresh Blocker. Especially Chrome on my Android phone jumps around frenetically when I try to read the news feed. I am curious if ARB would still work.