There's an addon for Text Fragment support in Safari and Firefox: https://github.com/GoogleChromeLabs/link-to-text-fragment

If someone sends this link to you, it will open just fine. If you send a link to someone else there's a very high probability they use Chrome. Otherwise, you can recommend them this extension.

It's the first time I heard about this new potentially standard feature, and it's very very useful. Thank you!