It would be useful to expose in Firefly applications the ability to read an arbitrary FITS file, browse its headers and any extensions, and be able to visualize whatever subset of data types Firefly can natively handle (e.g., image, basic table).
Mutatis mutandi for other file types we support.
This would be a useful debugging tool, but it would also be useful in the JupyterLab environment where plugins can be associated with specific "file" types in the file browser component.
Then, if users have FITS files in their workspace storage, they can open them in the JupyterLab environment with simple UI actions.
It may also be of interest in other Firefly application contexts, e.g., in IRSA, to offer this capability, but of course there are security issues associated with providing a general "upload a FITS file and we'll tell you all about it" capability.