Since this is the Snow Leopard forum, and Google has stopped supporting Chrome on Snow Leopard, I'm going to make a wild guess that you are NOT running Snow Leopard. That should not matter, but there is a "Tab Pinning" feature on the more recent Safari, so if you are running El Capitan or Sierra, you can control click on the tab and pin it so that it cannot be accidentally closed. I have a bunch of Safari and Firefox tabs pinned, including some of the discussions.apple.com forums.