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How can I see the files and the source code of installed apps?
For packaged apps I’d expect to be able to see all files (HTML, CSS, JS, images etc.), for hosted apps I’d expect to be able to see the manifest, and possibly locally cached files (if the hosted app has offline support).
When I connect my smartphone with a PC (via USB), I can’t find any app files (only user-generated content like photos etc.).
Note that I don’t want to browse the files on an external code repository; I want to see the files that are actually installed on my device.
(A solution for this question would probably also be a solution for the related question How can I check if an installed Firefox OS app is hosted or packaged?, but there might be other solutions than checking the source code so they are not duplicates.)