My Roundcube installation is only available via
https. However,
http://docs.roundcube.net/doc/help/ does not exist in an
https version. As a consequence, the
help plugin creates
iframe tags with
http URLs within an
https page. Firefox rejects such mixed requests and the help screen shows an empty page. I've read that IE also does not like mixing insecure protocols into a secure page.
There are (at least) two workarounds possible on my end:
1. I ask my users to set
security.mixed_content.block_active_content = false in their Firefox browsers. Not a good idea.
2. I host a copy of the user documentation on my web server so it can be accessed via
https. Haven't checked the copyright situation...
I think it would be easier if the help pages were available via
http and
https. If the plugin could automagically pick the appropriate protocol, that would be cool for sites that support both protocols. Sites that support only one can edit
$config['help_source'] in the config file.