I get redirected to mypps when using Firefox

If Firefox is still redirecting you to MyPPS after a reinstall, I’d suspect something outside the Firefox program itself. Check your Firefox extensions first, then try Firefox in Troubleshoot Mode. If it still happens there, check your DNS/proxy settings and run a malware scan. Reinstalling Firefox usually won’t remove a bad profile or a system-level redirect, so deleting the browser alone may not touch the thing causing it.