I don't see any benefit in this type of blanket, all or nothing, type of approach. In fact, I see it doing more damage than good. Encrypting blogs, news websites, etc still makes no sense to me. I'm actually disappointed in Mozilla for looking at doing this. As a developer I respect many of their products and see them as champions of the web in a lot of ways.
HTTPs does not:
- protect a user from malware on their own system with keylogging taking place
- increase security in outdated and insecure websites (eg: old known exploitable code)
- prevent any browser drive-by downloaders or exploits
- increase the security of the web server itself (web stack thats serving requests) - yeah that's you using a private VPS without doing Kernel updates.
These are likely the major factors of why people have security issues. What is forcing HTTPS on the entire web actually doing? Who is it benefiting? The government can still snoop your data in-flight. If someone is connected to a fake wifi endpoint there is on the fly SSL decryption out there.....
Do we still need TLS for actual secure transactions that deal with personal data? Yes, of course. That's what it is intended for.
Do we need TLS to read the latest TMZ post about Miley Cyrus? You decide... (oh and it's http if you were wondering)