firefox: Improve mixed-content handling
firefox: Improve mixed-content handling

block_object_subrequest: Seems to mostly apply to Flash, but refers to
Objects on a page making a request, and preventing when they're HTTP but
the parent page is HTTPS.

upgrade_display_content: HTTP display content is transparently changed
to HTTPS, which, with block_display_content, should make content which
is available in HTTPS, but incorrectly referenced as HTTP, render.

amarshall/dotfiles,amarshall/dotfiles,amarshall/dotfiles,amarshall/dotfiles