I used the autohide_bookmarks_and_main_toolbars.css from MrOtherGuy, but it blocks the top part of the page where I need to click.
Using firefox 144 on windows 10
here’s what i’m using

@import url("colored_soundplaying_tab.css");
@import url("cleaner_extensions_menu.css");
@import url("icons_in_main_menu.css");
@import url("autohide_bookmarks_and_main_toolbars.css");
@import url("minimal_in-UI_scrollbars.css");
@import url("selected_tab_gradient_border.css");
@import url("test.css");

the top 3 imports are from https://github.com/datguypiko/Firefox-Mod-Blur/ and some hiding context menu items.