After downloaded the app I changed a lot of settings, including checking the box to "open previous windows and tabs" on start in settings, however next time I opened the browser it didn't open my previous tabs and when I went to check the setting the box was unchecked and it won't allow me to check it. Why did this happen and how can I fix it? Note: IIRC, I changed all my settings and then created a Mozilla account and that is the only possible connection to this issue that I can think of.