"C:\Program Files (x86)\Mozilla Firefox\firefox.exe"
"C:\Program Files\Mozilla Firefox\firefox.exe"

Does GMX appear any time you click the Home button or launch a new window (Ctrl+n), or does GMX only appear at startup (using desktop icon)? '''''Any New Window''''' Are you able to change your home page setting on the Options page? This article has information on that setting: [[How to set the home page]]. If Firefox ignores the setting, look for a hijacker: <p>Here's my suggested procedure for tracking down and cleaning up bad add-ons and other hijackers. I know it seems long, but it's really not that bad.</p> <p>(1) Open the Windows <strong>Control Panel</strong>, Uninstall a Program.</p> <p>After the list loads, click the "Installed on" column heading to group the infections, I mean, additions, by date. This can help in smoking out undisclosed bundle items that snuck in with some software you agreed to install. <em>Be suspicious of everything you do not recognize/remember, as malware often uses important or innocent sounding names to discourage you from removing it.</em></p> <p>Take out as much trash as possible here. If you're not sure, feel free to post program names or a screenshot of the list.</p> <p>(2) Open Firefox's <strong>Add-ons page</strong> using either:</p> <ul> <li>Ctrl+Shift+a (Mac: Command+Shift+a)</li> <li>"3-bar" menu button (or Tools menu) &gt; Add-ons</li> <li>in the Windows "Run" dialog, type or paste<br>firefox.exe "about:addons"</li> </ul> <p>In the left column, click <strong>Extensions</strong>. Then, if in doubt, disable (or Remove, if possible) unrecognized and unwanted extensions. <em>All extensions are optional; the troublemaker might not be obvious from its name.</em></p> <p>Before Firefox 57, a link sometimes would appear above at least one disabled extension to restart Firefox to make the change effective. You can complete your work on the tab and click one of the links as the last step. In Firefox 57, disabling should be immediate, but you may need to reload pages to notice any change.</p> <p>Any improvement?</p> <p>(3) You can search for remaining issues with the <strong>scanning/cleaning tools</strong> listed in this support article: [[Troubleshoot Firefox issues caused by malware]]. These on-demand scanners are free and take considerable time to run. If they finish quickly and especially if they require payment, you may have a serious infection. I suggest the specialized forums listed in the article in that case.</p> Hopefully that will flush anything on your system and in your Firefox that could be a problem. '''''Only Desktop Shortcut''''' The Firefox icon can be set up to launch specific pages at startup (or more specifically, when you use the icon). To check whether that is set: First, open the shortcut as follows: * Desktop shortcut: right-click the icon, choose Properties * Pinned taskbar icon: right-click the icon, right-click Mozilla Firefox, choose Properties Windows normally will select the Shortcut tab. If not, go ahead and click the Shortcut tab. You'll see the Target highlighted. On Windows, that usually is no more and no less than the following (depending on 32-bit/64-bit): "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" "C:\Program Files\Mozilla Firefox\firefox.exe" If anything follows after that, try clearing it out. After OK'ing the Properties dialog, you can test right away to confirm that Firefox now launches only your home page. Either: * double-click desktop shortcut * right-click pinned taskbar icon, click Mozilla Firefox Success?