8|Y^z_C 据悉，Firefox 21将在美国当地时间本周二正式对外开放下载。不过，现在用户可以在
Mozilla的服务器上下载到桌面版的Firefox 21。如果是执念于官方版Firefox 21的用户，建议要随时留意在Firefox.com上推送的更新通知。
EA>$t \z ck<4_?1] 截止到现在，Mozilla还没有公布Firefox 21的官方更新日志。不过，我们倒是可以从beta版一探究竟：
`^N;%[c`z NEW: Enhanced three-state UI for Do Not Track (DNT).
)'<zC NEW: Firefox will suggest how to improve your application startup time if needed.
&q` =xF NEW: Preliminary implementation of Firefox Health Report (see FAQ).
o_$r*Z|HG CHANGED: Ability to Restore removed thumbnails on New tab Page.
Qg oXOVo6 CHANGED: Add-ons History API removals in Places.
;j_#,Da9< CHANGED: CSS -moz-user-select:none selection changed to improve compatibility with -webkit-user-select:none (bugs 816298).
cRfX CHANGED: Graphics related performance improvements (bugs 809821).
AU$5" kBE CHANGED: Removed E4X support from SpiderMonkey.
%r,2ZLZ DEVELOPER: Implemented Remote Profiling.
E m.? DEVELOPER: Integrated, Add-on SDK loader and API libraries into Firefox.
) DLK<10 HTML5: Added support for <main> element.
rC*n Z* HTML5: Implemented scoped stylesheets.
,zyrBO0 Eq FIXED: Some function keys may not work when pressed (833719).
Zd%\x[f9ck FIXED: Browsing and Download history clearing needs unification to avoid confusion on clearing download history
dX3> j{_ 另外，虽然Mozilla还没有推出Android正式版的Firefox 21，还是它仍然会在Google Play上为用户带来beta的更新。
j KQP0 t- 下面是该版本的更新日志：
bU,& |K/ NEW: Shipping Open Sans and Charis fonts for Web Content.
Q\z*q,^R NEW: Ability to save media files on long tap.
U)o8Tr CHANGED: Polished UI based on Holo theme.
e)bqE^JP CHANGED: CSS -moz-user-select:none selection changed to improve compatibility with -webkit-user-select:none (bugs 816298).
e
O}mZN CHANGED: Graphics related performance improvements (bug 809821).
MU^Z*r CHANGED: Removed E4X support from SpiderMonkey.
wLbns qa DEVELOPER: Implemented Remote Profiling.
MdfkC6P DEVELOPER: Integrated, Add-on SDK loader and API libraries into Firefox.
[(K^x?\Y0' DEVELOPER: DOM/content implementation for <input type=’time’> Associated bugs.
Te/)[I'Tn HTML5: Added support for <main> element.
8+ W^t I HTML5: Implemented scoped stylesheets.
MLb\:Ihy FIXED: Download Manager page is not updated after clearing private data(777639).
0nuFWV FIXED: In content UI cut off on small screens(840593).
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