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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Modern Comparison Slider
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Separator Widget
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Markdown Comment
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Eazy Enable Blogroll
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ShortLinks Pro – Affiliate Links, Link Shortening, Click Tracking & Marketing
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Media Trim — Unused & Duplicate Media Cleaner
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Autocomplete Location Field for Contact Form 7
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Slim Maintenance Mode
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WP One Metric
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WP SendGrid SMTP
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Attachment Usage
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Easypay Mobile Money
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Auto Post for Task Scheduler
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WP API SwaggerUI
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Smart Testimonials plugin
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Simple Divi Shortcode
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Read More Button – Expand Content Without Refresh
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RD Order Note Templates for WooCommerce
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Design Import/Export – Styles, Templates, Template Parts and Patterns
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FancyPost – Post Blocks, Grids & Sliders for Block Editor and Elementor