Yolo Hey, sorry for the delay. Currently no, since it's not compatible, and I'm not planning to update the current codebase to Flarum v2. The reason is that I'm waiting to launch compatibility with Flarum v2 once the new version of Fancybox is released!
I recently spoke with Janis, the developer of Fancyapps (Fancybox...), and he plans to launch the upcoming version (v6), very soon. It's generally ready, but it'll take a bit more time to achieve feature parity with the current v5 and complete the documentation. Once it's released, I plan to work on the implementation directly for Flarum v2.
This extension is a wrapper, it doesn't make any changes to the content or format of the posts/articles. When you disable the extension, everything will return to how it was before using it (Markdown, BBCode…).