1.0b5pre:
    * Extensive Firefox 4 support, including:
      - Fully restartless. Can now be installed, uninstalled,
        enabled, disabled, and upgraded without restarting Firefox.
      - Tabs in :buffer completions and listings are grouped
        by panorama groups.
      - Only visible tabs are considered in tab numbering,
        gt/gn/gN, etc.
    * Improved startup time by a factor of 7.
    * Significant completion speed improvements, especially for
      JavaScript.
    * Greatly improved private mode support and :sanitize command.
      - Full integration with Firefox data clearing dialogs.
      - Support for sanitizing items at shutdown.
      - Fine-grained control over what data is sanitized and for
        what timespan.
      - Support for sanitizing reference to particular hosts,
        everywhere from command-line and message history to option
        values and cookies.
    * New and much more powerful incremental search implementation.
      Improvements over the standard Firefox find include:
      - Starts at the cursor position in the currently selected
        frame, unlike Firefox, which always starts at the start of
        the first frame.
      - Returns the cursor and viewport to their original position
        on cancel.
      - Backtracks to the first successful match after pressing
        backspace.
      - Supports reverse incremental search.
      - Input boxes are not focused when matches are highlighted.
    * It's now possible to map keys in many more modes, including
      Hint, Multi-line Output, and Menu.
    * Ex command parsing improvements, including:
      - Multiple Ex commands may now be separated by |
      - Commands can continue over multiple lines in RC files by
        prefixing the continuation lines with a \
      - The \ character is no longer treated specially within single
        quotes, i.e., 'fo\o''bar' ⇒ fo\o'bar
    * Command line is now hidden by default. Added c, C, and M to
      'guioptions'.
    * Hint mode improvements, including:
      - Added g; continued extended hint mode, which allows
        selecting multiple hints. Removed ;F.
      - Hints are now updated after scrolling and window resizing.
      - ;s now prompts for a filename on the command-line rather
        than in a dialog.
      - Added ;a and ;S modes for creating bookmarks and search keywords.
      - Added 'hintkeys' option.
      - Added "transliterated" option to 'hintmatching'.
    * JavaScript completion improvements, including:
      - The prototype of the function whose arguments are currently
        being typed is displayed during completion.
      - Non-enumerable global properties are now completed for the
        global object, including XMLHttpRequest and encodeURI.
    * The concept of completion contexts is now exposed to the user
      (see :h :contexts), allowing for powerful and fine-grained
      completion system customization.
    * The external editor can now be configured to open to a given
      line number and column, used for opening source links and
      editing input fields with <C-i>. See :h 'editor'.
    * Command changes:
      - :viusage, :optionusage and :exusage were replaced with :listkeys,
        :listoptions and :listcommands, providing more powerful and
        consistent interactive help facility (improvements include
        listing keys for modes other than Normal, filtering the output
        and linking to source locations).
      - :downloads now opens a download list in the multi-line output
        buffer.
      - Added :cookies command.
      * :extadd now supports remote URLs as well as local files on Firefox 4.
      * Added :if/:elseif/:else/:endif conditionals.
      - Added -charset and -post to :bmark.
      - Added -keyword, -tags, -title to :delbmarks.
      - Added :extrehash, :exttoggle, :extupdate, and :rehash commands.
      - Added :feedkeys command.
      - Added -sort option to :history.
      - Added several new options, including -javascript, to :abbrev and :map.
      - Added :mksyntax command to auto-generate Vim syntax files.
      - :open now only opens files beginning with /, ./, ../, or ~/
      - :saveas now provides completions for default file names, and
        automatically chooses a filename when the save target is a
        directory.
      - Added :write !cmd and :write >>file.
      - Added :yank command.
      - :delmarks, :marks and :qmarks now also accept ranges, same as
        :delqmarks.
    * Improvements to :style and :highlight:
      - Added -agent flag to :style.
      - The -append flag now updates existing properties rather than
        simply appending its arguments to the previous value.
      - Active filters are now highlighted in :style listings.
      - :style-related commands now divide their completions between
        those active and inactive for the current site.
      - CSS property name completion is now available.
    * IMPORTANT option changes:
      - Boolean options no longer accept an argument.
      - 'cdpath' and 'runtimepath' no longer treat ",,"
        specially. Use "." instead.
      - 'incsearch', 'hlsearch', 'ignorecase', and 'smartcase' have
        been replaced with 'incfind', 'hlfind', and 'findcase'.
      - 'extendedhinttags' is now a regexpmap rather than a
        string.
      - 'guioptions' default value has changed.
      - 'laststatus' has been replaced with the "s" flag in
        'guioptions'.
      - 'linksearch' has been removed.  The \l search modifier can
        still be used for this purpose.
      - 'loadplugins' is now a regexplist option rather than
        a boolean.
      - 'mapleader' is now an option rather than a :let
        variable.
      - 'showstatuslinks' and 'showtabline' are now string options.
    * IMPORTANT: Command script files now use the *.penta file extension.
    * IMPORTANT: Plugins are now loaded from the 'plugins/'
      directory in 'runtimepath' rather than 'plugin/'.
    * IMPORTANT: Option value quoting has changed. List options will
      no longer be split at quoted commas and the option name,
      operators, and = sign may no longer be quoted. This will break
      certain automatically-generated configuration files.
      See :help stringlist
    * Option changes:
      - Added "bookmarks", "diverted", and "links" to 'activate'
        option.
      - Added 'altwildmode' and <A-Tab> command-line key binding.
      - Added 'autocomplete' option for specifying which completion
        groups should be auto-completed.
      - Added 'banghist' option.
      - Replaced 'focuscontent' with 'strictfocus'.
      - 'complete' now defaults to "slf" but file completion only
        triggers when the URL begins as above.
      - Added 'passkeys' option.
      - Changed 'urlseparator' default value to '|'.
      - Added "passwords" and "venkman" dialogs to :dialog.
      - Added 'wildanchor' option.
      - Added 'cookies', 'cookieaccept', and 'cookielifetime' options.
    * Added BookmarkChange, BookmarkRemove autocommands.
    * Removed the :source line at the end of files generated by
      :mkpentadactylrc.
    * gf now toggles between source and content view.
      The | key binding has been removed.
    * Page zoom information is now shown in the status bar, and
      change in zoom status no longer appears in :messages.
    * Added ZO, ZI, ZM, and ZR as aliases for zO, zI, zM, and zR.
    * Completion list now behaves better when the multi-line output
      window is displayed.
    * Major help system improvements:
      - Plugins may now provide full-fledged ':help' documentation.
      - Add basic plugin authorship documentation.
      - The help system is newly modularized and features significant
        updates, rewrites, and formatting improvements.
      - Added <A-F1> to open the single unchunked help page.
    * Removed :beep.
    * Removed :edit, :tabedit, and :winedit aliases.
    * Removed :play.

