theme-store/themes/5c4d7772-d963-4672-ab03-e9d541438881/chrome.css

:root {
  --bmb-sound-icon-scale: 1.5;
  --bmb-sound-icon-scale-essentials: 1.26;
  --bmb-sound-icon-scale-glance: 1.15;
}

/* ================== General ================== */
/* Hide firefox sound button */
.tab-audio-button {
  display: none !important;
}

/* Tab icon overlay styles */
.tab-icon-overlay {
  border: none !important;
  transform: translate(130%, 44%) scale(var(--bmb-sound-icon-scale)) !important;
  background-color: transparent !important;
  transition: 0.2s;

  &:is([soundplaying], [muted], [activemedia-blocked]) {
    display: block !important;
  }
}

/* Ensure sound icon is still visible when tab not selected */
#navigator-toolbox:not([zen-sidebar-expanded])
  #tabbrowser-tabs
  .tab-icon-overlay:is([soundplaying], [muted], [activemedia-blocked]):not(
    [selected]
  ) {
  display: block !important;
}

/* Fill sound button on hover; ensure icon is displayed */
#navigator-toolbox #tabbrowser-tabs .tabbrowser-tab {
  & .tab-throbber,
  & .tab-icon-pending,
  & .tab-icon-image,
  & .tab-sharing-icon-overlay,
  & .tab-icon-overlay {
    &:is([soundplaying], [muted]) {
      &:hover {
        fill: var(--zen-colors-primary) !important;
        transition: 0.2s;
        display: block !important;
      }
    }
  }
}

/* ================== Zen essentials (expanded tabs) ================== */
#navigator-toolbox[zen-sidebar-expanded] {
  .tabbrowser-tab[zen-essential] {
    /* Hide tab icon image for collapsed tabs and essentials */
    &:is([soundplaying], [muted], [activemedia-blocked]) .tab-icon-image {
      display: none !important;
    }

    & .tab-throbber,
    & .tab-icon-pending,
    & .tab-icon-image,
    & .tab-sharing-icon-overlay,
    & .tab-icon-overlay,
    & .tab-icon-stack {
      &:is([soundplaying], [muted], [activemedia-blocked]) {
        transform: translate(20%, 25%)
          scale(var(--bmb-sound-icon-scale-essentials)) !important;
        display: block !important;
        /* Remove extra margin created for vanilla icons */
        margin-inline-end: -2em !important;
        margin-inline-start: -2em !important;
      }
    }
  }
}

/* ================== Zen glance tab (expanded tabs) ================== */
#navigator-toolbox[zen-sidebar-expanded] {
  .tabbrowser-tab[zen-glance-tab] {
    /* Hide tab icon image */
    &:is([soundplaying], [muted], [activemedia-blocked]) .tab-icon-image {
      display: none !important;
    }

    & .tab-throbber,
    & .tab-icon-pending,
    & .tab-icon-image,
    & .tab-sharing-icon-overlay,
    & .tab-icon-overlay,
    & .tab-icon-stack {
      &:is([soundplaying], [muted], [activemedia-blocked]) {
        transform: translate(-8%, 25%) scale(var(--bmb-sound-icon-scale-glance)) !important;
        display: block !important;
        margin: 0px !important;
      }
    }
  }
}

/* ================== Zen glance tab (pinned tabs) ================== */
#navigator-toolbox[zen-sidebar-expanded]
  #tabbrowser-tabs
  .tabbrowser-tab[zen-glance-tab] {
  & .tab-throbber,
  & .tab-icon-pending,
  & .tab-icon-image,
  & .tab-sharing-icon-overlay,
  & .tab-icon-overlay {
    &:is([soundplaying], [muted], [activemedia-blocked]) {
      margin: 0px !important;
      transform: translate(-35%, 25%) scale(var(--bmb-sound-icon-scale-glance)) !important;
      display: block !important;
    }
  }
}

/* ================== Pinned tab (tab page changed) ================== */
#navigator-toolbox[zen-sidebar-expanded] {
  .tabbrowser-tab[zen-pinned-changed] {
    /* Add extra space for sound button when reset tab button is active */
    &:is([soundplaying], [muted], [activemedia-blocked]) {
      .tab-reset-pin-button {
        margin-right: 2.8em !important;
      }
    }

    & .tab-throbber,
    & .tab-icon-pending,
    & .tab-icon-image,
    & .tab-sharing-icon-overlay,
    & .tab-icon-overlay {
      &:is([soundplaying], [muted], [activemedia-blocked]) {
        transform: translate(180%, 45%) scale(var(--bmb-sound-icon-scale)) !important;
      }
    }
  }
}

/* ================== Expanded tabs ================== */
#navigator-toolbox[zen-sidebar-expanded] #tabbrowser-tabs .tabbrowser-tab {
  & .tab-throbber,
  & .tab-icon-pending,
  & .tab-icon-image,
  & .tab-sharing-icon-overlay,
  & .tab-icon-overlay {
    &:is([soundplaying], [muted], [activemedia-blocked]) {
      margin-right: 36px !important;
      margin-left: 0px !important;
    }
  }
}

/* ================== Split view (expanded tabs) ================== */
#navigator-toolbox[zen-sidebar-expanded]
  #tabbrowser-tabs
  .tabbrowser-tab[split-view] {
  /* Sound icon takes place of tab icon if tab is not pinned */
  &:is([soundplaying], [muted], [activemedia-blocked]):not([pinned])
    .tab-icon-image {
    display: none !important;
  }

  & .tab-throbber,
  & .tab-icon-pending,
  & .tab-icon-image,
  & .tab-sharing-icon-overlay,
  & .tab-icon-overlay {
    /* Replace tab icon image with sound button; not needed if tab is pinned or essential */
    &:is([soundplaying], [muted], [activemedia-blocked]):not(
        [zen-essential],
        [pinned]
      ) {
      transform: translate(-40%, 46%) scale(var(--bmb-sound-icon-scale)) !important;
      margin-right: 12px !important;
      margin-left: 4px !important;
    }

    &:not([pinned]) {
      margin-left: 0px !important;
    }
  }
}

/* ================== Collapsed tabs ================== */
#navigator-toolbox:not([zen-sidebar-expanded]) {
  .tab-icon-overlay {
    transform: translate(-40%, 46%) scale(var(--bmb-sound-icon-scale)) !important;

    /* Prevent sound/media button from being toggled on click when collapsed tab out of focus */
    &:is([soundplaying], [muted], [activemedia-blocked]):not([selected]) {
      pointer-events: none !important;
    }
  }

  .tabbrowser-tab:is([soundplaying], [muted], [activemedia-blocked])
    .tab-icon-image {
    display: none !important;
  }
}