Safari under OS X 10.14.5 corrupted
Safari had become exceedingly slow and many times returning "You are not connected to the internet" when other applications were operating fine: Mail, Firefox, Speedtest.
System comprised of: MacBook Pro 15 inch late 2107 running OSX 10.14.5 (Mohave), 100MBs connection over Ethernet.
Initially the Safari would operate over WiFi, albeit slowly but seemed to be unable when the computer was brought to base and connected over Ethernet. Following the advice of an earlier (ca2014) entry in this group I removed a Safari prefs file and a .db file. Unfortunately this made matters worse. At this point, Safari is not loading and I, apparently, need to install a new copy.
Is it even possible to do this without reinstalling the operating system?
Thanks for any assistance.
John
MacBook Pro Retina