Hi 532kupulau, it sounds like you might have a bad add-on or other software modifying your Firefox settings. What is the address of the wanted startup page? You might be able to copy/paste that from the address bar into a reply. Or you could post a screenshot. This article has tips on how to capture that: [[How do I create a screenshot of my problem?]] Please cut out or blur any sensitive information in the image before attaching it to your reply. ---- A common culprit for this problem would be an extension. You can view, disable, and often remove unwanted or unknown extensions on the Add-ons page. Either: * Ctrl+Shift+a (Mac: Command+Shift+a) * "3-bar" menu button (or Tools menu) > Add-ons In the left column, click Extensions. Then cast a critical eye over the list on the right side. All extensions are optional. If in doubt, disable. Often a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step. Any improvement?