HSTS is HTTP Strict Transport Security, a means to enforce using SSL even if the user accesses the site through HTTP and not HTTPS.
More Plugins
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WP Sitemap
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Advanced Google Maps Shortcode
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Safe Paste
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Disable Thumbnails, Threshold and Image Options
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bib.ly – Bible reference links to all bible sites
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Duplicate Taxonomy Term
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Mojito Shipping
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Tag Sticky Post
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Mindvalley Post & Get Variables
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Simple NoAI and NoImageAI
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BuddyPress Private Messages for Friends Only
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WP Anti Copy – Protect your precious content from copying
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TW Pagination
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Social Media Profile with Gallery
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Clenex
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Comment Expirator
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GN Product and Image Remover
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Custom Classes
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Switch Core
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Custom Menu Driven Prev/Next Links