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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PRyC WP: Add custom content to post and page (top/bottom)
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Thumbnails and Featured Images
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qText X Widget
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LP Estimated Reading Time
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Quick Drafts Access
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Webvizio
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seQura
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Display During Conditional Shortcode
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GFit Virtual Tryon
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Blockbuddy
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WP Custom Data
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U.S. Debt Clock Widget
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Prune WooCommerce Orders
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Russian Currency
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MerPress
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Website Copy Protection
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WP Title Case
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Zodan Mini Admin Menu
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Wareki
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Enable Numeric Slugs