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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IMG Title Restore
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Simple Custom Content Adder
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Cryptocurrency Payments & Donations with Copperx
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Audible Site Search
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Widget for Zendesk Chat via API
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Like Share Zalo Button
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bbPress Unread Posts
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Device Mockups
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ez Schedule Manager
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Custom Archive Titles
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Prevent Concurrent Logins
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Show Content Only
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Moby Blog
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WP Dashboard Cleaner
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ThemeDiv Social Widget
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Update from Bottom
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Advanced Dates
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Inline Navi
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Popup for CF7 with Sweet Alert
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Post Types Unlimited