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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User Admin Simplifier
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Auto Subscribe Users
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QuickSwish – WooCommerce Product Quick View
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Gallery Showcase for WordPress
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Actionwear products sync
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Custom Thank You Page for WooCommerce
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iContact Lead Forms
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Yummy Cookies
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RomanCart Ecommerce
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Webcake – Landing Page Builder
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WP Duplicate Posts And Pages
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Revix Reviews – All-in-One Business Review Manager
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Mega Forms – Drag & Drop Form Builder with Multi-Step & Conditional Logic
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Remove Special Characters on Upload
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Print Array
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AVE – Elementor & Gutenberg Addons
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Cache Purge Helper
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ACF Enhanced Message Field
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Simple Points and Rewards for WooCommerce – Create a Loyalty Program
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Gmap Block