This is a useless advice as there is no accountability/testing for these claims.... you cannot even be sure what kind of fish that you are buying nowadays (organic is even harder to prove). DNA testing would solve that, but the FDA apparently don't have the budget. For example: https://www.nydailynews.com/life-style/health/one-third-fish... .
That's where the "research" bit comes in. Take that report to your fish-monger[1] and ask him about it. If he has a strong opinion about it he's probably a keeper. If not, ditch him and get your fish from somewhere else. Again, check online vendors.
Using a different browser (technically, a different rendering engine) is not allowed on the iPhone. There are alternative browsers like Chrome, but they use the iPhone Safari rendering engine and serve merely to sync your bookmarks and whatnot with your other Chrome bookmarks and provide a slightly different UI.