It is unusual that the Refresh feature did not solve this problem, because it removes the most common reasons for it. First, could you confirm that this is not a home page problem: when you launch a new window using Command+n you get your specified home page or pages, and not the unwanted page. ''If you get the unwanted page in a new window:'' (A) Please double-check your home page setting here: * [[Startup, home page and download settings]] * [[How to set the home page]] (B) Investigate your extensions to see whether you find anything unexpected. You can open the Add-ons page using either: * Command+Shift+a * "3-bar" menu button (or Tools menu) > Add-ons In the left column, click Extensions, then cast a critical eye on whatever is shown on the right side. Second, could you check this article and in particular look for a possible optional user.js settings file which Firefox would use to override your previous session preferences at startup: [[How to fix preferences that won't save]]. You can rename or delete that file (unless you created it yourself, it was created by some other software on your computer). Any progress?