EDIT:gabrielachamartin mentioned these steps already, sorry I hadn't noticed.
Found in another thread. These exact instructions worked for me.
Open Finder
On the top toolbar click GO
Click Computer from the drop-down list
Choose the drive your Mac operates from
Go to the Library folder
Go in the folder Application Support and delete anything to do with VSearch
Go back to your Library folder, and then into LaunchAgents folder, delete anything to do with VSearch
Do the same steps for the folder LaunchDaemons, delete all files to do with VSearch
Restart safari
Also, follow Ulysses' directions as well as stated above.