Attributes Inspector button for Custom Buttons
Shows tooltip with with all attributes and allow open DOM Inspector for current node

Usage:

• Use middle-click or Ctrl + left-click to inspect node in DOM Inspector
  (additionally hold Shift key to enable pupup locker)
• Hold Shift key to show and don't hide tooltips and popups

Hotkeys:

• Escape – cancel or disable popup locker
• Ctrl+Up, Ctrl+Down – navigate to parent/child node
• Ctrl+Left, Ctrl+Right – navigate to previous/next sibling node (since v. 0.6.1pre)
• Ctrl+Shift+C – copy tooltip's contents
• Ctrl+W – inspect node's window object in DOM Inspector (since v. 0.6.3pre)

Screenshot: