Plugins
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Debug Bar
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Debug Bar Post Meta
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Debug Bar Query Tracer
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Debug-Bar-Extender
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Newsletter - Send awesome emails from WordPress
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Pods - Custom Content Types and Fields
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Regenerate Thumbnails
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Reveal IDs
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RTL Tester
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Theme Check
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Twitter Widget Pro
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Use Google Libraries
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WordPress Gallery Plugin - NextGEN Gallery
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XML Sitemap Generator for Google