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72版本可以用的收藏夹多列模式全部css代码: hbox[part="innerbox"] > .popup-internal-box > .arrowscrollbox-scrollbox, .panel-arrowcontainer > .panel-arrowcontent > .popup-internal-box > .arrowscrollbox-scrollbox .scrollbutton-up.menupopup-scrollbutton + scrollbox, .scrollbutton-up.menupopup-scrollbutton + spacer + scrollbox { display: block !important; column-count: 3 !important; column-width: 225px !important; -moz-column-width: 225px !important; -moz-column-rule: 1px solid #ccc; column-rule: 1px solid #ccc; padding-top: 4px; padding-bottom: 4px } /* Overall minimum width: accommodate full column count */ #bookmarksMenu menupopup, #BMB_bookmarksPopup, .panel-arrowcontainer > .panel-arrowcontent > .popup-internal-box > .arrowscrollbox-scrollbox { min-width: calc(3 * (225px + 5px)) !important; } /* Subfolder minimum width: accommodate folder column count */ #bookmarksMenuPopup .bookmark-item[container="true"] menupopup[placespopup="true"], #BMB_bookmarksPopup menupopup[placespopup="true"], #PlacesToolbarItems .bookmark-item[container="true"] menupopup[placespopup="true"] { min-width: calc(3 * (225px + 5px)) !important; /* column-count: var(--foldercolumncount); */ } /* Force item widths so each has its own line */ #bookmarksMenuPopup menu, #bookmarksMenuPopup menuitem, #bookmarksMenuPopup menuseparator, #PlacesToolbarItems .bookmark-item > menupopup[placespopup="true"] menu, #PlacesToolbarItems .bookmark-item > menupopup[placespopup="true"] menuitem, #PlacesToolbarItems .bookmark-item > menupopup[placespopup="true"] menuseparator, #PlacesChevronPopup .bookmark-item, #PlacesChevronPopup .bookmark-item > menupopup[placespopup="true"] menu, #PlacesChevronPopup .bookmark-item > menupopup[placespopup="true"] menuitem, #PlacesToolbarItems .bookmark-item > menupopup[placespopup="true"] menuseparator, #BMB_bookmarksPopup menu, #BMB_bookmarksPopup menuitem, #BMB_bookmarksPopup menuseparator { width: 225px !important; } /* Clean up item and separator spacing */ #BMB_bookmarksPopup menu, #BMB_bookmarksPopup menuitem, #BMB_bookmarksPopup menuseparator { padding: 0 2px 0 2px !important; margin: 0 !important; } #PlacesToolbarItems .bookmark-item > menupopup[placespopup="true"] menuseparator { margin: 0 !important; padding: 0 !important; } .subviewbutton.panel-subview-footer { min-height: 1px !important; border-top: none !important; } /* Pack more in vertically */ #BMB_bookmarksPopup menu, #BMB_bookmarksPopup menuitem { min-height: 1.5em !important; } /* Remove scrolling triangles from classic menu */ #bookmarksMenuPopup .autorepeatbutton-up, #bookmarksMenuPopup .arrowscrollbox-overflow-start-indicator, #bookmarksMenuPopup .arrowscrollbox-overflow-end-indicator, #bookmarksMenuPopup .autorepeatbutton-down { display: none !important; } 注: from: http://tieba.baidu.com/mo/q/checkurl?url=https%3A%2F%2Fforum.userstyles.org%2Fdiscussion%2F79660%2Ffirefox-developer-70&urlrefer=e8b71ad478d4758563169d545b54eb64 这个本是70版本兼容的, 但是在72版本炸了. 经过多次尝试发现好像是":root"这个变量空间可能被改动了所以这里稍微改了下, 把相关的值写死就行了. 效果: 收藏夹3列模式使用方法: 把上面的代码, 塞入userChrome.css文件, 重启firefox即可. 如果你不知道"userChrome.css"是什么,请参考以下: http://tieba.baidu.com/mo/q/checkurl?url=https%3A%2F%2Fwww.userchrome.org%2F&urlrefer=733f5b0da27d2f1b89d081ee7e8d1e23 http://tieba.baidu.com/mo/q/checkurl?url=http%3A%2F%2Fkb.mozillazine.org%2FUserChrome.css&urlrefer=e79d34a1ee53bea365414ddf782b3dbd