Jason is a single app that lets you summon and bookmark multiple Jasonette apps simply by entering the JSON url, without building your own physical app or setting up development environment.
It's good for using as a container for single purpose apps or quick disposable apps, prototyping, beta testing, etc..
As made clear by the CSP spec, browser bookmarklets shouldn't be affected by CSP. [..]
But, none of the browsers get this correct. All cause CSP violations and prevent the bookmarklet from functioning.
Though its highly discouraged, you can disable CSP in Firefox as a temporary workaround. Open up