After a recent update, I noticed that my toolbar changed suddenly. I was able to rebuild it how I like and most of it stays, however, the "Open A New Tab" button refuses to stay where I want it. Whenever I open a new window of Firefox, the "Open A New Tab" button is found on the leftmost side of my screen beside the new tabs. If I go to the "Customize Toolbar" page, I am able to move it so it stays to the right of the rightmost tab, which is where I want it to be. Anytime I open a new window, whether it's through dragging a tab onto another monitor, or opening Firefox the first time after turning on my computer, my change gets reversed. How can I permanently move this button to the desired position? This did not become an issue until an update about a week or so ago.