Simply prevent duplicate submissions by blocking the submit button while submitting
More Plugins
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hiWeb Theme Switcher
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cPanel Manager (from iControlWP)
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SEO Metrics
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Document Engine – Download Posts as PDF, PDF Embedder, Posts to PDF
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bbPress: Auto Delete Spam Replies
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VK Block Patterns
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دیوار آتش برنامه نویس
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Interactive US Map
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Woo Product Carousel and Zoom
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Juicy Contact Button
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Coral – Remote Images
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FaeCursor – Interaction Effects Toolkit
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Append or Prepend Content
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WP strong password
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Live Custom CSS JS Code Editor
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Adjustly Collapse
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MediaElement Google Analytics & Piwik Event Tracking
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Social Publisher
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Otpfy your Website
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SAR One Click Security