See this . This may help you . *https://support.mozilla.org/en-US/kb/how-do-i-delete-bookmark? Report us back if this work .

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */

#personal-bookmarks .bookmark-item > .toolbarbutton-icon {display:none!important}

Add code to the <b>userChrome.css</b> file below the default @namespace line. *http://kb.mozillazine.org/userChrome.css ---- <pre><nowiki>@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */ #personal-bookmarks .bookmark-item > .toolbarbutton-icon {display:none!important} </nowiki></pre> ---- The customization files userChrome.css (user interface) and userContent.css (websites) are located in the <b>chrome</b> folder in the Firefox profile folder. *http://kb.mozillazine.org/Editing_configuration You can use this button to go to the currently used Firefox profile folder: *Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)