I hope they give a setting choice similar to:
* Block all non-HTTPS sites
* Prompt on all non-HTTPS sites (view/no-view confirmation, perhaps with a "remember choice for this site" option.)
* Automatically allow all non-HTTPS sites, with a yellow warning bar and disabling of JavaScript.
* Automatically allow all non-HTTPS sites, with a yellow warning bar.
* Automatically allow all non-HTTPS sites, withOUT a warning bar.
(There may be a way to simplify this by putting some of the questions in the warning bar.)
Mozilla has gotten brazen lately about forcing questionable changes on users in the name of progress (per their view of "progress"). This includes forced tabs*, goofy search bar "split" (eventually fixed), and disabling "back" on POST forms (instead of prompting). They gave very round-about and fishy reasons for all 3 of these.
* Fortunately somebody created a "Hide tab bar for 1 tab" addon. Thank You, Fixers!