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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Blockenberg — 600+ Advanced Gutenberg Blocks for WordPress Block Editor
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Simple Text Shortcodes
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WP Keyboard Navigation
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AAM Protected Media Files
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Notification : bbPress
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ShopMagic Abandoned Cart Recovery for WooCommerce
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Cookie Dunker
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Animate Slider
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Admin Private Note on users
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WP Our Team
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ShinyStat Analytics
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EZ Countdown Timer
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BuddyPress Elevator Pitch – Enhanced Member Cards
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SAFFIRE AI Product Recommendations for WooCommerce
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A Dashboard Notice
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Add post thumbnail image to RSS feed
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Local Avatars by Nocksoft
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Sales Counter For WooCommerce
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Collapsible Archive Widget
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WP Goal Tracker – Goal Tracking for Plausible Analytics