This is just a suggestion.
According to bootstrap's documentation the following meta tag must be included in order to display responsive pages properly on devices:
<meta name="viewport" content="width=device-width, initial-scale=1.0"> }}}
It would be nice if the extension itself could add this meta tag when the responsiveCss option is set to true in the configuration file so you don't have to add it manually.
Best regards, and thanks for your hard work.