jsFilesExtensions setting is broken - expects a string

[Silvia Marmol]

glean.jsFilesExtensions (Default: [ "js", "jsx", "ts", "tsx" ]) is the description on the repo.

Problem: I noticed I was not getting any quick suggests except 'extract to file' regardless of file type. I believe this suggestion comes from glean.

I tried setting the extension file setting, but I get this:

[Miguel]

+1