I open Firefox and have a blank page. Can't open settings, options, go to any websites. Other browsers work. Tried reinstalling, restarting computer. I try to use Troubleshooting mode BUT Firefox doesn't close properly. If I close it with X but it still shows as running in Task Manager and things like Uninstall/Re-install and re-opening Firefox won't work until I terminate one of the two running processes. Worth noting is that when I re-install/re-download, when the installation process finished, I got a "vcruntime140_1.dll was not found" message. It stopped working after I installed the NET framework that League of Legends requires. After setting up my laptop, I had to set downloads to go to my D drive. Could this have impacted Firefox if it tried to update after this change? AFAIK, all files were+are in my C drive that are involved with Firefox, just trying to provide all the information that I can.