https://bugzilla.redhat.com/show_bug.cgi?id=1160935
--- Comment #15 from Jason Merrill jason@redhat.com --- (In reply to Nicolas Mailhot from comment #12)
(In reply to Jason Merrill from comment #11)
Thanks, but I'm not trying to find a better Helvetica substitute, what I want is for Facebook to look better in Firefox. I think the Chrome behavior quoted in comment #5, i.e. skipping Helvetica in the web font list rather than looking for a substitute, makes a lot of sense.
That may work for some pages but given how some web designers inist on pixel-perfect designs Helvetica really needs to be substituted by something with the same metrics
For pages that only request Helvetica, sure. In this case, the page requests "helvetica, arial, sans-serif", so the web designer clearly isn't expecting pixel-exact layout.