I switched to Canary to fix this issue, which has a much less aggressive gesture. Now a slide switch (almost like iOS's unlock screen) transparently overlays th

I switched to Canary to fix this issue, which has a much less aggressive gesture. Now a slide switch (almost like iOS's unlock screen) transparently overlays the screen until you slide across your trackpad, then it goes back a page. No need to touch OS X settings. :) I was glad it was no longer sensitive, but I was still wondering why they didn't just implement Safari's page-reveal as you slide back. Then I tried using the Github website, which implements its own transitions using the History API, which worked splendidly on Chrome but was rather broken in Safari. The best compromise would be to see what sites implement the history API and switch, but I'm satisfied with working side-scrolling for now.