This right on the heels of the GitLab 17.11 release announcement [0] which mentioned that they added OpenVSX support to their Web IDE. One of the biggest blockers for my team to use the Web IDE/GitLab's equivalent of "Codespaces" was the lack of extensions support.
As developers, we're spoiled for widespread (e.g.) vim keybindings support in just about any IDE via extensions. When unable to use it in something like Web IDE, it is very frustrating and makes it less useful as a product.
[0] https://about.gitlab.com/releases/2025/04/17/gitlab-17-11-re...