Web devs: If you want to provide some kind of custom search within your site, give me an input or button. Stop hijacking CMD+F to trigger your search instead of a page search.
@thomas Agreed. Although, what do you make of GitHub's hijacking when you are vieiwng file contents? As large code files aren't always fully rendered, the hijacked CMD+F allows you to find across content that might not yet be rendered.
@elliot I think the default UX should never be changed. In some cases (like that one) it totally makes sense to provide a way to search differently, but imo that should never replace the default UX without the user explicitly choosing to do so.