Prego!
Ho unito la discussione con una prededente.
Riporto il codice aggiornato con le modifiche per Firefox 107.
/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/multi-row_bookmarks.css made available under Mozilla Public License v. 2.0
See the above repository for updates as well as full license text. */
/* Makes bookmarks toolbar span multiple rows */
#PersonalToolbar{
--multirow-bmb-n-rows: 3; /* Control how many rows are shown before scrolling */
--multirow-bmb-row-margin: 2px; /* Control how much spacing is between rows */
max-height: none !important;
}
#PlacesToolbar > hbox:not(#PlacesToolbarDropIndicatorHolder){
display: block;
width: 100vw;
}
#PlacesToolbarItems{
display: flex;
flex-wrap: wrap;
/* --uc-bm-padding is defined in autohide_bookmarks_toolbar.css */
max-height: calc(var(--multirow-bmb-n-rows) * (4px + 1em + (2 * (var(--multirow-bmb-row-margin) + var(--uc-bm-padding,var(--bookmark-block-padding)))))) !important;
overflow-y:auto;
scrollbar-color: var(--lwt-accent-color) var(--toolbar-bgcolor) ;
scrollbar-width: thin;
}
/* Hide the all-bookmarks button */
#PlacesChevron{ display: none }
/* Add some spacing between rows */
#PlacesToolbarItems > .bookmark-item{
margin: var(--multirow-bmb-row-margin) 3px !important;
visibility: visible !important; /* Just in case they would be hidden for some reason */
}