Reticle

Drag and resize a ruler overlay to quickly measure pixel dimensions, positioning, and alignment of elements on any webpage.Report issues and submit suggestions on github (pull requests are also welcome!):

https://github.com/billdami/reticle

FEATURES
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* Inspired by the excellent Mac app, Crosshairs (http://giantcomet.com/crosshairs)
* Super quick and easy to use, just click and drag anywhere on the page to draw an overlay, then move and resize it to your heart's content.
* Lightweight and minimalistic UI
* Use keyboard shortcuts to interact with the extension (see below for full list)
* Toggle between a primary and alternate overlay color
* Customize the overlay colors and opacity/transparency

AVAILABLE SETTINGS (Right-click extension button > Options)
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* Primary overlay color (hex color value)
* Alternate overlay color
* Overlay opacity/transparency level

KEYBOARD SHORTCUTS
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* Ctrl/Cmd+Shift+X - Toggle extension (This can be customized in Extensions > Keyboard shortcuts)
* Esc - Deactivate extension
* Arrow keys - Move overlay
* Shift+Arrow keys - Move overlay by 10px
* Alt+Arrow keys - Resize overlay
* Shift+Alt+Arrow keys - Resize overlay by 10px
* Ctrl/Cmd+Up/Down - Increase/decrease overlay opacity
* Tab - Toggle between primary and alternate overlay color
* Delete / Backspace - Clear the current overlay

CHANGELOG
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v1.0.1 (June 14, 2014)
* BUGFIX: Overlay resize handles were not being hidden when dragging a newly drawn overlay