SeaMonkey 2.49.4

New Features:
*The delimiter for forwarded messages can now be configured.
*An option to not strip signatures on reply has been added to prevent top signatures from deleting the body.
*The Gamepad API has been finalized and enabled
*navigator.plugins is no longer enumerable, for user privacy.
*ECMAScript Internationalization API has been enabled.
*'box-sizing' (dropping the -moz- prefix) has been implemented.
*SharedWorker is now enabled by default.
*CSS3 variables have been implemented.
*Console object is now available in Web Workers.
*Promises have been enabled by default.
*<input type="number"> has been implemented and enabled.
*<input type="color"> has been implemented and enabled.
*Fixed several stability issues.

# Fixes
* Yahoo Mail was broken trying to register a mailto protocol handler.
* The horizontal HTML5 audio/video volume control was broken with the Modern theme.
* Forwarding a message without CC header inline put an empty "CC:" line in the header table.
* The Google CalDAV OAuth2 authentication dialog was not shown with Lightning installed.
* The folder list in the message filter dialog was empty.

- Newsgroup names can now be entered using autocompletion.
- The Gamepad API has been finalized and enabled.
- VP9 video decoding has been implemented.
- Support for Opus in WebM was added.
- Volume control for HTML5 audio/video has been added.
- Mac OS X Notification Center support has been added for web notifications.
- Support for spdy/2 has been removed.
- Support for multi-line flexbox in layout has been added.
- Support for the MathML 2.0 mathvariant attribute has been added.
- Background thread hang reporting has been added.
- <input type=color> has been implemented and enabled.
- Fixed several stability issues.

- The Character Encoding menu has changed.
- SeaMonkey no longer automatically BCCed yourself when replying to yourself (unless it was the actual sent mail that had the original bcc header set).
- Reply-All on an email previously sent To:yourself with Bcc:others had no recipients.

# Fixes
- Arrow keys did not work on the restore session page.

# Features
* Newsgroup names can now be entered using autocompletion.
# Fixes
* The "Trust junk mail headers set by" menu list could show entries multiple times.
* "Reply-to:" was not honored for To=From with different Reply-To.
* PulseAudio support has been disabled for now.
* The background color for https sites in the location bar is now more obvious (pref: browser.urlbar.highlight.secure).
* Having two identical account names is now prevented.
* Help was updated for the removal of Personas.
* The style of the about:privatebrowsing page has been improved and the content was rearranged.
* Labels for falsestart-rsa and falsestart-rc4 permissions were added to the Data Manager.
* The title of the "Quit SeaMonkey" dialog was misleading when closing just the browser.
* Feeds now support the received date, i.e. store a Received trace header.
* Folder pane scrolling performance has been improved for feed folders.
* Reopening a saved draft re-added deleted automatic CC or BCC recipients.
* Confirming the Sync View Quota dialog could throw an error.
* Feed folder auto-creation could fail and derived folder names were not sanitized.
* Certain RSS protocol feeds were treated as duplicates and not stored.

* Features
- The DoNotTrack and Prompt on Sanitize preferences are now kept in sync
- A pref (mailnews.p7m_external) has been added to allow users to choose an alternate application/pkcs7-mime handling
- Support for Atom Threading Extensions (RFC 4685) has been added
- Migrating profiles from Thunderbird supports the new signons file format now (support for the old format has been dropped)
- Autocomplete drop-downs (e.g. used on the Location Bar and Open Location dialog) now show favicons for their entries
- The account name is now displayed in the status bar for all messages when checking mail
- IMAP alert messages now show the server of the corresponding mail account
- Newsgroup names are now searched for all search strings combined (AND-search) on the subscribe dialog
* Fixes
- The return receipt request prompt had stopped appearing
- The value of the "Messages more than x days old" checkbox in Synchronization settings of News accounts is now saved correctly
- The MailNews context menu showed all possible options when only feed accounts were set up
- The Account Manager can be used again even if Local Directory is deemed unsafe
- The <items> list of feeds is now ignored, fixing the output of "(no subject)" articles while parsing the RSS of Planet Python
- Interfering with the restoring of a tab session could lead to an incomplete session getting saved
- HTML + plain-text (multipart) email messages with wrong encoding are now upgraded to UTF-8 properly
- The Folder Properties labels for incoming mail character encoding have been changed from "Default" to "Fallback"
- Help has been updated for the changes to SSL warnings and new options for the mixed content blocker on the SSL Preference pane
- Default Character Encoding has been renamed to Fallback Character Encoding (together with a note) on the Mail & Newsgroups Character Encoding Preferences pane
- The S/MIME Content-Description mail header could be invalid due to non-encoded 8-bit data
- Non-email feed author values were put in angle brackets, which could cause display issues in certain cases

- Fixed incompatibility with binary extensions such as Lightning.