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Best extension plugins for WordPress

The most popular extension plugins for WordPress in November 2026, in WordPress.org’s own popular order, which follows active installs. Polylang Theme Strings leads with 5K+ active installs, ahead of Elfsight Blocks for Elementor (2K+) and Add Any Extension to Pages (2K+). All 42 plugins tagged “extension” are below, with figures from WordPress.org that update every day.

Installs aren’t everything: a recent release, a “Tested up to” that matches the current WordPress, and support threads that get resolved show a plugin is looked after. Open any plugin for its downloads, rank history and alternatives.

Research this niche or see all plugins.

Top 10 extension plugins

  1. 1.
    Polylang Theme Strings

    The most installed extension plugin, with 5K+ active installs. Rated 4.0 from 37 reviews, last updated 8 years ago. Tested only up to WordPress 4.9.35.

  2. 2.
    Elfsight Blocks for Elementor

    2K+ active installs. Only 2 reviews so far, updated 10 months ago. Tested only up to WordPress 6.8.12.

  3. 3.
    Add Any Extension to Pages

    2K+ active installs. Rated 5.0 from 6 reviews, updated 2 months ago.

  4. 4.
    PT Theme Addon

    1K+ active installs. Only 1 review so far, last updated 8 years ago. Tested only up to WordPress 4.9.35.

  5. 5.
    Theme Toolkit

    700+ active installs. No reviews yet, last updated 8 years ago. Tested only up to WordPress 4.9.35.

  6. 6.
    Add .html Extension to Pages

    700+ active installs. Only 1 review so far, last updated 2 years ago. Tested only up to WordPress 6.5.14.

  7. 7.
    WP Compress for MainWP

    400+ active installs. Only 3 reviews so far, updated 2 months ago.

  8. 8.
    MailPoet Checkout Subscription for WooCommerce (Legacy)

    300+ active installs. Rated 4.8 from 10 reviews, last updated 8 years ago. Tested only up to WordPress 4.9.35.

  9. 9.
    ESB URL Extension

    100+ active installs. Only 3 reviews so far, last updated 11 years ago. Tested only up to WordPress 4.1.42.

  10. 10.
    MailPoet Gravity Forms Add-on

    100+ active installs. Only 4 reviews so far, last updated 12 years ago. Tested only up to WordPress 3.9.40.

All 42 plugins tagged “extension”