HTTPS Everywhere works great, all the time, for me. I've never heard of "HTTP Nowhere". If you were just misremembering the name, it might have been a long ago old version? Or maybe the borrowed computer was otherwise jacked.
I believe HTTP Nowhere is similar to HTTPS Everywhere, but it "fails closed" - if there isn't an HTTPS version of a site, HTTP Nowhere just doesn't show you that site.
I really hope we one day get to a world where it's feasible to have HTTP Nowhere on by default. There are a shocking number of sites which don't support HTTPS, probably because they are suffering some misapprehension about the overhead it adds. Amazon does a bizarre thing where they bounce you back and forth between HTTP and HTTPS depending on how much information about you that they feel a page reveals. It's quite an unstable situation for such a high value target. I wouldn't be surprised if there are a number of spearphishing and MITM attacks that take advantage of Amazon's cavalier attitude towards its customers' safety and privacy.
I guess I considered it more aspirational than declarative. "Revolution Now!", "HTTPS Everywhere!", etc. :)
HTTP Nowhere looks like it takes a much harder line, which I hope will someday be practical for general usage.
I'll have to look into HTTPS Everywhere. Thanks for the recommendation.