Failed download list appearing repeatedly even after removing it from history ?

I had downloaded some power points n articles from google drive . some of them were failed to download. i deleted them from history. i uninstalled mozilla and installed it again but still as i start a new session download symbol gets activated and library is full of failed downloads !!!! something virus or what ?????

If it happens again then check for problems with the <b>places.sqlite</b> database file in the Firefox profile folder.
*http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
*https://support.mozilla.org/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file
*Places Maintenance: https://addons.mozilla.org/firefox/addon/places-maintenance/

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