Druid Bar is a movable mana bar that keeps track of your current mana, even in a shapeshifted form like bear or cat. remember that this addon is an estimation of your mana, and it could be slightly higher or lower depending on your level(Lower levels will have more problems since there is much less room for error with their smaller mana pools).
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=====If for whatever reason your mana bar disappears and you just can't find it, or there's other really weird behavior, do /dbar reset. it'll reset the mod as if you just did a fresh install of it. This should fix most problems people might have=========
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Slash Commands: /druidbar or /dbar
parameters: [on/off/toggle/vis/width/height/hide/lock/replace/player/text/message/status]
Explination of the parameters:

On/Off/Toggle: This will toggle running of the addon. toggle switches between on and off.

Vis: This will enable or disable any and all graphical stuff. if you use with other addons like StatusBars or Linoleum, turn it off. If not, leave it on ^^

Width (#): This will let you set the width of the bar. Default is 160px.

height (#): This will let you set the height of the bar. Default is 18px.

percent: This toggles between 3 options: Showing Raw mana, showing %Mana, and showing both. Works for both the normal bar and Replace.

hide: This will toggle on/off the hiding of the bar when in caster form.

full: This will toggle on/off the hiding of the bar in animal forms when your mana is at 100%

lock: This will toggle on/off locking the position of the bar.

replace: This will replace the Player Frame's mana bar, splitting it into two when shifted.

player: This will make the bar show up directly under the Player Frame. You know, where a lot of other addons like to place your Experience Bar.

Text: This will toggle between 3 options: No text, "Classic" text, or "Modern" Text. (Modern having a border, Classic having no border). This option carries over for both the normal bar and the replaced bar.

Message (toggle/bear/cat/aqua/travel) (say/party/raid/emote) (message): Message allows you to customize saying when you shift into/out of a form. More of a novelty item I did for a guildie, it's here in case you want it too. More in-depth info about the message parameter: