follow_along_with_video_below_to_see_how_to_install_our_site_as_web_app
Note: this_feature_currently_requires_accessing_site_using_safari
I'm still not convinced flagging does anything 90% of the time.
If I'm bored I keep hitting F5 on the page and flagging it again. Usually after 5 or 6 of those the page gets taken down.