## Summary
Removes the legacy mask editor. May also want to remove the "Beta" tags
on all the current mask editor components/mentions in the app now as
well.
## Context
Telemetry data shows zero users using the legacy mask editor. It has
been considerable time since we switched to the new one, and there
really is no reason to use the legacy version given how lacking it is.
In https://github.com/Comfy-Org/ComfyUI_frontend/pull/7332 (v1.35.2 -
Dec 11, 2025), we added a final warning that the legacy mask editor is
being removed.
On 1.36, this PR can be merged, as more than enough warning will have
been given.
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7370-cleanup-remove-the-legacy-mask-editor-and-all-related-code-2c66d73d365081d58fbed0f3c84bcb0d)
by [Unito](https://www.unito.io)
* docs: Clarify extension terminology and dev server limitations
* docs: removed unecessary callout to extension docs in main readme, in favor of the contributions.md
* docs: remove key points
* docs: change docs structure for better semantics and extensibility
* docs: add warning emoji
* docs: remove mention of 3D core extensions
* docs: add feedback in
