doej1367's questions

“书签上下文菜单”左侧有足够的空间放置符号。我希望有一个剪刀图标用于剪切功能，一个双页图标用于复制功能，一个垃圾图标用于删除功能等等。是否有插件或 CSS 代码片段可以将这些图标放在那里？

感谢@MC10，以下是我现在使用下载的图片，以便它在离线环境中也能工作。

    #placesContext_sortBy\:name::before {
        content: url('file://C:/Users/User/AppData/Roaming/Mozilla/Firefox/assets/sort.svg');
        width: 16px;
        padding-right: 1em;
        filter: invert(1);
    }
    
    #placesContext_show_folder\:info::before,
    #placesContext_show_bookmark\:info::before {
        content: url('file://C:/Users/User/AppData/Roaming/Mozilla/Firefox/assets/edit.svg');
        width: 16px;
        padding-right: 1em;
        filter: invert(1);
    }
    
    #placesContext_deleteFolder::before,
    #placesContext_deleteBookmark::before {
        content: url('file://C:/Users/User/AppData/Roaming/Mozilla/Firefox/assets/delete.svg');
        width: 16px;
        padding-right: 1em;
        filter: invert(1);
    }
    
    #placesContext_deleteFolder,
    #placesContext_deleteBookmark {
        font-weight:700 !important;
        color:#d70022 !important; 
    }

    #placesContext_cut::before {
        content: url('file://C:/Users/User/AppData/Roaming/Mozilla/Firefox/assets/cut.svg');
        width: 16px;
        padding-right: 1em;
        filter: invert(1);
    }
    
    #placesContext_copy::before {
        content: url('file://C:/Users/User/AppData/Roaming/Mozilla/Firefox/assets/copy.svg');
        width: 16px;
        padding-right: 1em;
        filter: invert(1);
    }
    
    #placesContext_paste_group::before {
        content: url('file://C:/Users/User/AppData/Roaming/Mozilla/Firefox/assets/paste.svg');
        width: 16px;
        padding-right: 1em;
        filter: invert(1);
    }
    
    #placesContext_new\:bookmark::before {
        content: url('file://C:/Users/User/AppData/Roaming/Mozilla/Firefox/assets/plus.svg');
        width: 16px;
        padding-right: 1em;
        filter: invert(1);
    }
    #placesContext_new\:folder::before {
        content: url('file://C:/Users/User/AppData/Roaming/Mozilla/Firefox/assets/folder-add.svg');
        width: 16px;
        padding-right: 1em;
        filter: invert(1);
    }
    
    #placesContext_new\:separator::before {
        content: url('file://C:/Users/User/AppData/Roaming/Mozilla/Firefox/assets/subtract.svg');
        width: 16px;
        padding-right: 1em;
        filter: invert(1);
    }