HideBars can hide the default blizzard bar; shapeshift, stance, aura, stealth, shadowform, presence, etc. For example a druid has shapeshifting, warrior has battle/defense/berserk stance, pally has aura, rogue has stealth, deathknight has presence and priest has shadowform. The icons could rather be moved from the spell book manually to the action bars to take advantage of keybinds and other features. Or a player in the forums mentioned we can still use keybinds for special action button 1-10 without having to move spells to the action bar - thanks miu

SLASH COMMANDS:

/hidebars (to show help)
/hidebars off (stop using the addon and show the bars)
/hidebars on (enable and hide the bars) (default setting)

INSTALLATION:

In Windows XP, extract the ZIP file, to your World of Warcraft interface addons directory, which might look like,
...\World of Warcraft\Interface\AddOns\HideBars

UNINSTALL:

Remove the game folder, .\World of Warcraft\Interface\AddOns\HideBars
Remove variable file, .\World of Warcraft\WTF\Account\%youraccount%\SavedVariables\HideBars.lua

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Known limitations:

none

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Change log:

(see "changes" section in website)