How can I remove map frontier and their annoying ads?
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There are several possibilities as to why this is happening.

Open Safari and go to preferences. (under Safari in the menu bar)
Go to extensions in preferences and choose to uninstall any that you are not familiar with.
Under General in preferences, check to make sure your homepage is what you'd like it to be.

If this doesn't solve the issue, it may be slightly more complicated. But not too bad. Join me on a Monday night town hall and I'd be happy to finish it if removing the Safari extension doesn't do the trick.