by Adam Silverstein 0 (0 reviews)

Client-Side Media Everywhere

Name: Client-Side Media Everywhere
Author: Adam Silverstein

Enables client-side media processing on Firefox and Safari via COEP/COOP cross-origin isolation headers.

Client-Side Media Everywhere ranks #68,154 among WordPress.org plugins with 0+ active installations, is #5,904 of 6,299 in the Media category, and was last updated Sep 12, 2026. Data from WordPress.org, refreshed twice daily — see methodology.

Compatible with WP 7.1

v1.2.0 Current Version v1.2.0

Updated 3 days ago Last Update on 12 Sep, 2026

Refreshed 12 hours ago Last Refreshed on

#5,904 of 6,299 in Media Actively maintained

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Rank

#68,154

-12665 this week

Active Installs

-100%

KW Avg Position

— No change

Downloads

218

+4 today

Support Resolved

— No change

Rating

Review 0 out of 5

0 (0 reviews)

Next Milestone 10

Total Progress 0%

0+ 10+

42,341

Ranks to Climb

Growth Needed

8,000,000

Active Installs

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Rank Changes

Current #68,154

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Active Installs Growth

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Active Installs 0,000,000+

Growth +0.0%

Peak 0,000,000

Downloads Growth

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Reviews & Ratings

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Plugin Details

Version: 1.2.0
Last Updated: Sep 12, 2026
Requires WP: 6.8+
Tested Up To: 7.1
PHP Version: 7.4 or higher
Author: Adam Silverstein

Support & Rating

Rating: ☆ ☆ ☆ ☆ ☆ 0
Reviews: 0
Support Threads: 0
Resolved: 0%

Keywords

cross-origin Firefox media performance safari

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Frequently Asked Questions

Common questions about Client-Side Media Everywhere

Check that your site is served over HTTPS (or localhost). Client-side media processing requires a secure context; without one, cross-origin isolation is unavailable and WordPress silently falls back to server-side processing. The editor logs an informational message in the browser console explaining the reason for the fallback.

No. Chrome 137+ uses Document-Isolation-Policy, which is handled by WordPress core / Gutenberg. This plugin only activates on browsers that do not support DIP.

Not the front-end: the COEP/COOP headers are only sent on block editor admin pages, and only on browsers that need them (Firefox, Safari, Chrome < 137). Within the editor on those browsers, cross-origin isolation can break oEmbed previews, media served from third-party origins, popup-based authentication flows, and plugins that load editor assets cross-origin. See the Tradeoffs section for the details and for how to turn the headers off if you hit one.

Yes - deactivate the plugin. Sending the COEP/COOP headers is the plugin's only job, so there is no separate settings toggle: activating the plugin turns the behavior on, deactivating it turns it off. To keep the plugin active but suppress the headers programmatically (for example, per environment), use the csme_use_coep_coop filter: add_filter( 'csme_use_coep_coop', '__return_false' );

WordPress 7.1 converts HEIC images client-side where possible and server-side otherwise. This plugin no longer includes any HEIC handling of its own.