when open the photoshop stuck with adding extension process

using the cc desktop app to uninstall per https://helpx.adobe.com/creative-cloud/help/uninstall-remove-app.html)

uninstall all betas

test if problem's resolved

if not, uninstall problematic apps, restart your computer and reinstall the problematic apps.

test.  if the problem's resolved, you can probably reinstall the betas, but waiting a bit would be prudent.

in the future, to find the best place to post your message, use the list here, https://community.adobe.com/

p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post (like this one has already been moved) if it helps you get responses.

<"moved from using the community bugs">