Mozilla Firefox 3.0是 Firefox(火狐瀏覽器) 的下一代布局引擎，開發代號為“Gran Paradiso”。目前僅用于測試，適合 Web 程序開發者和 Firefox 的測試人員使用。今日 Mozilla Foundation 發布了 Firefox 3.0 第9個 Alpha 版本。

Mozilla Firefox 是一個自由的，開放源碼的瀏覽器，適用于 Windows、linux 和 MacOS X平臺，它體積小速度快，還有其它一些高級特征。主要特性有：標簽式瀏覽，使上網沖浪更快；可以禁止彈出式窗口；自定制工具欄；擴展管理；更好的搜索特性；快速而方便的側欄。

修補漏洞(Fixed Bugs)：
# #251910 [Firefox:Places]- No hover highlighting (i.e. mouse-tracking) in Bookmarks/History sidebar [All]
# #339754 [Core:Installer: XPInstall Engine]- Threadsafety asserts from Chrome registry when installing extensions [Lin]
# #368811 [Firefox:General]- Firefox crashes on exit after plugin install activated by InstallTrigger. install(xpi, installCompleteFunction) [Win]
# #386065 [Core:Layout: Form Controls]-legend {font-size:0;} still shows the text (yahoo.com mainpage) [Win]
# #386551 [Core:Disability access APIs]- expose ARIA description on document [All]
# #386585 [Core:ImageLib]- Update libpng to version 1.2.21 [All]
# #391740 [Toolkit:XUL Widgets]- listheader in richlistbox appears to right/at bottom of richlistitems [All]
# #391868 [Core:Layout]- Page Source very small with meta charset=windows-1258 [All]
# #394805 [Core:Layout: BiDi Hebrew & Arabic]- “ASSERTION: ResolveBidi called on non-first continuation” [All]
# #396745 [Directory:LDAP XPCOM SDK]- nsILDAPConnection: :Init should take an nsILDAPURL as a parameter instead of three others. [All]
# #397135 [Toolkit:XUL Widgets]- tree._ensureColumnOrder dies if no columns are defined [All]
# #397288 [Core:GFX: Thebes]- Missing text without fallback from U+0000-00FF fast path when first font-family doesn’t have necessary glyphs [Lin]
# #397296 [Firefox:Build Config]- Firefox builds need to use the current NSS CVS tag [All]
# #397434 [Firefox:Phishing PRotection]- Phishing update request is malformed [All]
# #397518 [Core:MathML]-” ASSERTION: The block in an {ib} split shouldn’t be living inside an inline” with mathml [Mac]
# #397796 [Toolkit:XULRunner]- Allow XULRunner apps to specify the name of xulrunner-stub via configure [All]
# #398056 [Toolkit:Breakpad Integration]- symbolstore.py does not recognize srcdirs with SVN when using svn-ssh [Lin]
# #398363 [Core:Widget]- Removing Cairo Checks in nsBaseDragService [All]
# #398512 [Core:Widget: Gtk]- crash on shutdown and before restart (gdk_display_close) with gtk xim module [Lin]
# #399048 [Core:Security: UI]- Add accesskeys to all buttons, make Get Certificate the default button (Add Exception dialog) [All]
# #399050 [Firefox:Download Manager]- directories created with wrong permissions [Lin]
# #399136 [Directory:LDAP XPCOM SDK]- 396745 broke nsLDAPChannel.cpp [Lin]
# #399259 [Firefox:Form Manager]- Form manager shouldn’t cache Login Manager service at startup. [All]
# #399354 [Core:SVG]- Some SVG filters not checking in2 requirement [Lin]
# #399440 [Firefox:Menus]- Work offline menu has incorrect state after cancelled request to go offline in sub windows [Mac]

想當小白鼠的朋友可以下載玩玩，不過建議初級用戶下載穩定的 V2.0.0.7 正式版
下載：Mozilla Firefox 3.0 Alpha 9 for Windows
下載：Mozilla Firefox 3.0 Alpha 9 for Linux
下載：Mozilla Firefox 2.0.0.7 簡體中文正式版