Truth is the first time I check this, but theoretically it was also deployed by default to Firefox some months ago (and I see it activated in my Nightly install).

Have any of you seen/noticed a difference when TCP is enabled? I wasn't paying attention when it was deployed.

The history (and other stuff) wiping is something I'm thinking about doing, but just for "health". I tend to accumulate open tabs to review later... that I never review. I started doing it in my cell phone, opening all links by default in private/expendable tabs. If the apps closes, they're gone. If the link is interesting, I'll do the effort of manually saving it somewhere.