I updated to Firefox 44 last night and since then when I open a browser window it just displays a blank page and not my home page. If I then click on the home icon in the navigation toolbar it displays the correct home page. I have checked the home page options and nothing has been changed, but it still won't open in it, just a blank page.

Since first posting this question I have updated Firefox twice and currently have 44.0.2 installed and am still having the same problem. I am using Start Page as my home page and it still just goes to a blank page when I open a browser window. I've also noticed that trying to open links from some, not all, email messages has the same effect. I tried switching to the Firefox start page as the home page and the problem didn't occur. It goes right to that page every time. Then I tried switching back to Start Page and the same old thing happened. Blank page. If I click the home page icon in the navigation toolbar it opens the page just fine, but it won't go straight to it when opening a browser window.