This plugin will allow you to add extensions to WordPress url as per your preference.
More Plugins
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Photo Gallery by Codexin – Image Gallery with Lightbox
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My Upload Images
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Fabrica Synced Pattern Instances
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Pretty RSS Feeds
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Outdated Plugin Notifier
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BP Profile Home Widgets
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Pk Google Analytics
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Buyte
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Slightly troublesome permalink
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Vertical Image Menu
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Take Control Of The WordPress Toolbar
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The Feedback Button
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CloudSearch
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BU Versions
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Remove CSS link IDs
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Featured image to All-Posts
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sermon.net display
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WD Quick Pages
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reCaptcha for WooCommerce
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Custom Post Slider