Is there a way to uninstall and re-install Safari? After installing Mavericks, Safari doesn't work anymore. THere is an unknown tab that keeps appearing, and I can't delete it. In the primary tab, where I have my home page, none of the links are active. If I click on them, the color pinwheel appears and just keeps spinning. Is it possible I have picked up some virus? My desktop iMac shows NONE of these symptoms, but my laptop Macbook pro is suffering.
Try troubleshooting Safari extensions and third party plugins.
From the Safari menu bar click Safari > Preferences then select the Extensions tab. Turn that OFF, quit and relaunch Safari to test. If that helped, turn one extension on then quit and relaunch Safari to test until you find the incompatible extension then click uninstall.
If it's not an extensions issue, try troubleshooting third party plug-ins.
Back to Safari > Preferences. This time select the Security tab. Deselect: Allow all other plug-ins. Quit and relaunch Safari to test.
If that made a difference, instructions for troubleshooting plugins here.