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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Advanced Custom Fields: Range Field
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淘宝客（官方接口）
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txt2img (山寨长微博)
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Dynamic QR Code – generator
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KP Tracking Code
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kontur Copy Code Button
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Cyphex Image Hunter
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Easy Stripe – Tips, Payments, and Donations
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Dynamic Latest Post in Nav Menu
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WPC Product Image Swap for WooCommerce
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Coupon Bulker
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Opinion System note & avis Demo
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Extended Super Admins
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Table of Contents Creator
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WP GeoNames
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Autopost for X (formerly Autoshare for Twitter)
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Gravity Forms: GDPR Framework Add-On
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Webhook for Bricks Forms
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Interac e-Transfer / Email Money Transfer (EMT) Gateway for WooCommerce
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Compress & Upload