Koberstein

This plugin adds an option under ‘General Settings’ for you to put your donation Bitcoin address. It places this address in hidden meta tags in the head section of your site. This allows your site’s Bitcoin address to be detected by browser extensions that allow visitors to make donations or microtips to your website.

Bitcoin Meta Tags

eSparkBiz

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This plugin will allow you to add extensions to WordPress url as per your preference.
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It is compatible for any WordPress site.
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<li>Append any extension to your WordPress url. Like .html, .php, .jsp, .xml, etc.</li>
<li>Append any extension to your WordPress Post and Page URL..</li>
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ESB URL Extension

This plugin will allow you to add extensions to WordPress url as per your preference.

Bitcoin Meta Tags vs ESB URL Extension