No Icons on bookmarks drop-down list anymore?

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http://www.linuxquestions.org – Hi. After installing latest Firefox on my new PC and importing bookmarks from old PC, none of my bookmarks in the pull down table have individual icons as seen on the navigation bar- just the 'blank page' icon. I've deleted bookmarks,navigated to the page and bookmarked it again,but still the blank page icon. Have re-installed Firefox but still no joy. Thanks in advance for your help. (HowTos)