This Connection is Untrusted
You have asked Firefox to connect securely to r1---sn-mv-jhie.c.docs.google.com, but we can't confirm that your connection is secure.
What Should I Do?
If you usually connect to this site without problems, this error could mean that someone is trying to impersonate the site, and you shouldn't continue.
This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connect to it securely. As a result, it is not possible to add an exception for this certificate.
technical detail
r1---sn-mv-jhie.c.docs.google.com uses an invalid security certificate. The certificate is only valid for the following names: *.googlevideo.com, *.c.doc-0-0-sj.sj.googleusercontent.com, *.gvt1.com (Error code: ssl_error_bad_cert_domain)