Extensions (Legacy) greyed out in Photoshop 25.11

[SnowDream39]

Is CEP extensions not supported in Photoshop now?

I am using Photoshop and Premiere Pro on Windows 11. I downloaded the source code from github, and put it into the folder "C:/Program Files/Common Files/Adobe/CEP/extensions/CEP_HTML_Test_Extension-12.0".

The extension works well in Premiere Pro, but in Photoshop, the "Extensions (Legacy)" is grey and I can't do anything. I have tried all ways I can find but nothing happened.

[Jeff Arola]

In Photoshop under Edit>Preferences>Plugins>Legacy Extensions do you have Load Extension Panels checked?

[SnowDream39]

Thank you for your help. That problem was my mistake.

[SnowDream39 · Accepted solution]

I have found the reason. The reason is that the latest version of Photoshop is 26, which supports CEP 12. I was silly.