The RSS Image Feed adds the first image of a post to your feeds, even in firefox and even if you only display the excerpt.
More Plugins
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Divine SIP Calculator
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Very Simple PayPal Donation Form
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WP User Frontend Integration for Ultimate Member
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I Motivazionali
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Widget for Zen
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Post Type Select Field for Advanced Custom Fields
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Heroic Favicon Generator
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Osom Login Page Customizer
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Basic Security: Prevent Cross Site Scripting
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Remove @User Autocomplete from Block Editor
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GenerateWP Embed
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WP Table Lookup
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Delete Bad Behavior Log
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WP Add CC email
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Age Gator
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Featured Image in Content
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Automatic Multilingual Translation by Autoglot
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WP Image Mask
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Unlock Addons for Elementor
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The Hack Repair Guy's Plugin Archiver