Web Search for virus+DOCtopdf https://www.bing.com/search?q=virus+DOCtopdf&qs=n&form=QBRE&sp=-1&pq=virus+doctopdf&sc=0-14&sk=&cvid=0FD6FBFA5DD5495485617AF129DB1E17 --------------- You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

It shows as an installed and enabled in the System Details list: * FromDocToPDF 7.600.10.55137 (_65Members_@download.fromdoctopdf.com) *https://support.mozilla.org/en-US/kb/disable-or-remove-add-ons *https://support.mozilla.org/en-US/kb/uninstalling-toolbars ---- Extensions that do not have a "Remove" button are installed globally by other software and are not under control of the Firefox extension manager. Globally installed extensions are usually found via a registry scan or are installed in a location that Firefox scans for installed extensions. *https://developer.mozilla.org/Installing_extensions *https://developer.mozilla.org/Adding_Extensions_using_the_Windows_Registry Extensions installed globally need to be removed via the settings (Options/Preferences) of the program that has added this extension or this program has to be uninstalled via "Control Panel -> Programs". In Firefox you can only disable such an extension. You can find the install location of a specific extension in the extensions.json file in the profile folder. You can open the extensions.json file in the Scratchpad and search for this extension. The descriptor field should list its install location. You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page. *Help -> Troubleshooting Information -> Profile Directory:<br>Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder *http://kb.mozillazine.org/Profile_folder_-_Firefox