One that I feel is underappreciated is the inline translation of whatever website you are browsing.
I don't speak well the language of the country I currently live in and Chrome really helps. I haven't really found a comparable feature or add-on in other browsers.
I'd switch to Firefox in a heartbeat if it offered a decent version of this.
And several more languages to be added soon have already been announced: Russian, Farsi, Icelandic, Norwegian, Ukrainian and Dutch. So there's probably much more to come.
On top of the integrated support for this in Firefox as of recently (that a sibling mentions), Mozilla has offered an extension for this for quite a while now.
I don't speak well the language of the country I currently live in and Chrome really helps. I haven't really found a comparable feature or add-on in other browsers.
I'd switch to Firefox in a heartbeat if it offered a decent version of this.