WebNavigatorBrowser is being flagged as adware and It took me a while to get it to uninstall.
I haven't tried the Safety Scanner on it, but MalwareBytes has a guide to get it removed. I hade to delete a parent file in AppData/local under the user profile, delete the Scheduled Task, and change the default browser back to Chrome or Edge/IE. But I've added the link to the removal guide. Hope it helps.
https://forums.malwarebytes.com/topic/265820-removal-instructions-for-webnavigatorbrowser/