Kasuga

This plugin adds a convenient copy button to every code block on your blog posts, allowing users to copy code with a single click.
Highlights:
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Easy One-Click Copying: Your blog visitors can instantly copy code to their clipboard by simply clicking a button on any code block.
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Flexible Customization: From a dedicated settings page, you can freely adjust the button’s position, size, color, and labels (for both before and after copying) to perfectly match your site’s design.
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Lightweight and Fast: The plugin only loads the necessary CSS and JavaScript, ensuring it won’t impact your site’s performance.
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This plugin makes it super easy for your blog visitors to grab code snippets. By adding a simple copy button to every code block, it boosts convenience and makes your code content much more user-friendly.

Sticky Copy Button for Code Blocks

Adds a customizable copy button to code blocks, making it easy for users to copy code with a single click.

Melissa Cabral

A simple, lightweight plugin that displays useful technical information on pages and posts to aid in developing WordPress Classic themes. Provides quick access to things that are sometimes hidden, like post/page ID, slug, taxonomy terms, and post type slug. Theme Inspector tells you exactly what conditional tags are true on each view, and what template file loaded on each page view.
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<li>Use In Conjunction with the <a href="https://docs.google.com/drawings/d/1hJ0MpHO3HKBT5KsTpGtc_gDYZ5pi-HyxNcRtmPBBULE" rel="nofollow ugc">WP Template Hierarchy Document</a>.</li>
<li>Theme Inspector is only visible to logged in Administrators.</li>
<li>Appears on the right-side of the Toolbar (admin bar).</li>
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Theme Inspector

A developer's inspector to illuminate the WordPress Template Hierarchy and help with building WordPress Classic themes.

Sticky Copy Button for Code Blocks vs Theme Inspector