[feelin_googley]

It sounds like Mozilla just wants to keep users confined to a pre-approved list of search engines. Are these also business partners with Mozilla, like Google?

Here are some other HTTPS-enabled search engines to test. If I am not mistaken all have been mentioned on HN in the past.

    https://wiby.me 
    https://gigablast.com
    https://mojeek.com
    https://unbubble.eu
    https://ecosia.org
    https://searx.me
    https://symbolhound.com
    https://findx.com

[kazagistar]

It looks like a mistake, not malice.

[Nomentatus]

you mean that the omission of the above lesser known engines was a mistake and they will soon appear? I grant that you're responding to a "response" that should have been a new thread, instead, since it's really a new topic - but it's not alleging the switch was malice.