Alpha Particles

Progress

• migrate SeaMonkey preferences panes to use (Bug 394522) is now complete including Proxies (Bug 444157), Popups windows (Bug 441403), Cache (Bug 444161), MailNews / Send Format (Bug 445009), Downloads (Bug 444582), HTTP Networking (Bug 444167), SSL (Bug 445013), Certificates (Bug 445014), MailNews / Addressing (Bug 408613), Master Password (Bug 444170), Passwords (Bug 444169), Validation (Bug 445015) and Browser / Languages (Bug 444411)
• add ability to show just the name and not the email address in the message pane if an address book entry exists: main part (Bug 309057)
• the return of Treelines: Venkman, DOM Inspector, MailNews, Help viewer, Bookmarks, History and XUL directory viewer (Bug 438793)

MailNews

• make IMAP folders offline by default if they are newly created and mail.server.default.offline_download pref is true (Bug 452615)
• display messages that are not present in the current folder view but found through a search (Bug 377084)
• resort when new message arrives and Sort by / Threaded is active (Bug 262319)
• do not ask whether to send HTML mail for recipients matching an "additional email" address of a contact that prefers HTML messages (Bug 437750)
• disable JavaScript in MailNews for now (Bug 453943)
• properly detect application/pkcs7-mime subtypes in libmime (Bug 456250)
• do not lose track of messages in a folder when using CONDSTORE (Bug 456601)
• add ability to download IMAP messages preemptively/automatically in the background (Bug 436615)

Address Book

• apply changes to phone types made in Apple Addressbook (Bug 452143)
• add birthday fields to address book (Bug 13595 and Bug 455797)
• update address book card preview pane for card changes via external interfaces (where notifications exist, e.g. OS X) (Bug 455240)

CSS

• add support for WebKit's CSS3 Transform proposal (Bug 435293)

DOM

• implement cloneNode() for HTML document nodes (Bug 42976)
• allow creating HTML documents through document.implementation.createDocument() (Bug 450160)

SVG

• support SVG mask/clip-path/filter effects in HTML (Bug 450340)

Certificates

• show Exception dialog before fetching certificate when prefetching is active (Bug 453855)

Printing

• remove useless "print.use_native_print_dialog" preference (Bug 414843)

General

• introduce new UI for setting SeaMonkey as default application/handler (Bug 441050)
• add trim, trimLeft and trimRight for JavaScript strings (Bug 305064)
• add hu (Hungarian) to source locales (Bug 453350)
• make FTP uploads of small files using File / Upload File menu report failures (Bug 389394)
• make migration of SeaMonkey profile not fail (possibly not migrating bookmarks) when folder in source profile is missing (Bug 423211)
• set colors for GTK treelines when no specific rule is given (Bug 434080)
• make transfer mode of images influence the lock icon state (mixed content) (Bug 135007)
• add bold default options to about:config context menus (Bug 255726)
• disable "Add to SeaMonkey" and add "Cancel Install" in right-click menu after installing extension (Bug 438755)
• let Software Update show a hint that the system clock may be off if the server certificate appears to be expired (Bug 390746)
• use correct order of buttons in Add-on Updates dialog appearing at startup (Bug 424317)
• do not delete a file dragged from Windows Explorer / FTP (Bug 296528)
• enable color management support for tagged images by default (Bug 418538)
• disable NetworkManager querying by default because its network link detection (which triggers Offline mode) cannot be trusted (Bug 424626)

Crashes

• do not crash when opening IMAP messages with inline images (Bug 454061)
• do not crash shutting down in cookie code (Bug 455035)

Update: added last three MailNews bugs that made the Alpha cut