Here&#x27;s the bug report from firefox about this issue[1].They removed it because it&#x27;s slow and because they feel that today page authors use large enough text.<p>So maybe the sensible thing to do is to convince the firefox team to enable it  as an option.<p>[1]<a href="https:&#x2F;&#x2F;bugzilla.mozilla.org&#x2F;show_bug.cgi?id=710298" rel="nofollow">https:&#x2F;&#x2F;bugzilla.mozilla.org&#x2F;show_bug.cgi?id=710298</a>