tabs_multiple_lines.css

/* Firefox userChrome.css tweaks ********************************************************/
/* Github: https://github.com/aris-t2/customcssforfx ************************************/
/****************************************************************************************/

/****************************************************************************************/
/* multirow / multiple tab lines - modified for CustomCSSforFx **************************/
/* all credits go to the original authors: **********************************************/
/* https://00.bulog.jp/archives/1476/ ***************************************************/
/* https://www.reddit.com/r/FirefoxCSS/comments/7dclp7/multirow_tabs_in_ff57/ ***********/
/* https://github.com/MrOtherGuy/firefox-csshacks/blob/master/chrome/multi-row_tabs.css */
/****************************************************************************************/


/* NOTE  ********************************************************************************/
/* Variables are set inside '.\config\' folders CSS files, if complete package is used! */

:root{
  --tabs-lines: 3;
  --tab_min_width_mlt: 100px;
  --tab_max_width_mlt: 200px;
  --tab-min-height_mlt: var(--tab-min-height,32px); /* set own value here, if used without configuration files */
}

#tabbrowser-tabs{
  min-height: unset !important;
  padding-inline-start: 0px !important
}

@-moz-document url(chrome://browser/content/browser.xhtml){
  #scrollbutton-up~spacer,
  #scrollbutton-up,
  #scrollbutton-down{
	display: var(--scrollbutton-display-model,initial);
  }

  scrollbox[part][orient="horizontal"]{
    display: flex;
    flex-wrap: wrap;
    overflow-y: auto;
    max-height: calc(var(--tab-min-height_mlt) * var(--tabs-lines));
    scrollbar-color: currentColor transparent;
    scrollbar-width: thin;
  }
}

.scrollbox-clip[orient="horizontal"],
#tabbrowser-arrowscrollbox{
  overflow: -moz-hidden-unscrollable;
  display: block;
  --scrollbutton-display-model: none;
}

.tabbrowser-tab{
  height: var(--tab-min-height_mlt);
}

:is(.tabs-newtab-button,#tabs-newtab-button) {
  height: var(--tab-min-height_mlt) !important;
}

#tabbrowser-tabs .tabbrowser-tab[pinned]{
  position: static !important;
  margin-inline-start: 0px !important;
}

.tabbrowser-tab[fadein]:not([pinned]) {
  flex-grow: 1;
  min-width: var(--tab_min_width_mlt) !important;
  max-width: var(--tab_max_width_mlt) !important;
}

.tabbrowser-tab > stack{
  width: 100%;
  height: 100%;
}

#alltabs-button,
:root:not([customizing]) #TabsToolbar #new-tab-button,
#tabbrowser-arrowscrollbox > spacer,
.tabbrowser-tab::after{ 
  display: none !important;
}

.tab-background {
  margin-block: unset !important;
}