Ninja forms shortcode isn't visible in popup pro

The shortcodes I applied is not visible in the popup. I have changed themes (default 2017) just to check if the theme might be the problem, but this did not slove the problem.

We checked for any JS errors in the firefox console and this is what we found:

Error loading this URL: Could not load the source for /config-wrap-start-default.js.
Error: "/config-wrap-start-default.js" is not in the SourceMap.
Stack: SourceMapConsumer_sourceContentForResource://gre/modules/commonjs/toolkit/loader.js -> resource://devtools/shared/sourcemap/source-map.js:1967:16
_getSourceText/<Resource://gre/modules/commonjs/toolkit/loader.js -> resource://devtools/server/actors/source.js:339:31
processResource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:917:23
walkerLoopResource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:801:7
scheduleWalkerLoop/<Resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:737:11
Line: 1967, column: 16