@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);

@-moz-document url("chrome://inspector/content/inspector.xul") {

#bxPanelSet {
    -moz-box-orient: vertical !important;
    }

}

@-moz-document url-prefix("chrome://inspector/content/viewers/") {

page {
    -moz-box-orient: horizontal !important;
    }

#mainPropContainer {
    min-width: 350px !important;
    }

}