I have been running firefox as my default browser for years. However, it has recently become difficult to get it to open (had to press the start tab several times), and now won't open at all. when I clicked on the app tab, the little icon begins to spin then stops. I have restarted my computer and just now uninstalled and reinstalled the program. No change. I have tried the tab on my desktop, and from the app page but it just won't kick in. I am at a total loss. I have a VPN, but turning it on or off makes no difference. what is wrong?