You can check the target line in the Firefox desktop shortcut (right-click: Properties) to make sure nothing is appended after the path to the Firefox program. *https://support.mozilla.org/en-US/kb/wrong-home-page-opens-when-i-start-firefox-how-fix You can check that those pages aren't set as (multiple) homepages. You can check the homepage setting. *Options/Preferences -> Home *https://support.mozilla.org/en-US/kb/how-to-set-the-home-page Firefox supports multiple homepages separated by '|' (pipe) symbols.