Simple user style that adds a muted time to the background of the columns in Google Calendar

gcal-column-times.user.css

@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document domain("calendar.google.com") {
    #tgCol1, #tgCol2, #tgCol3, #tgCol4, #tgCol5, #tgCol6 {
        background-image: url("data:image/png;base64,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");
        background-repeat: no-repeat;
        background position: top left;
    }
}