Created attachment 8920761 [details] Screen Shot 2017-10-21 at 12.07.30 AM.png User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:57.0) Gecko/20100101 Firefox/57.0 Build ID: 20171019140425 Steps to reproduce: I disabled source maps in devtools settings. Same issue reported here: https://stackoverflow.com/q/46679233/1959 Actual results: I cannot open any file in devtools anymore. Instead of file contents I see the text 'sourceMaps is null'. Toggling the source maps setting in dev tools does not fix the issue. Manually toggling the 'devtools.debugger.source-maps-enabled' setting in about:config seems to have fixed the issue.
Restarting the browser also did not fix the issue.
TypeError: sourceMaps is null in debugger.js:19729:11 And spoke too soon, toggling the devtools.debugger.source-maps-enabled doesn't seem to fix anything. The problem came back and I'm still unable to load any file in dev tools.
I don't see the "sourceMaps is null" in the editor, but I do see it in the browser console. For me the editor just says "Loading..." and never changes. The browser console says: TypeError: sourceMaps is null[Learn More] debugger.js:25005:1 I actually see several reports with different line numbers. These STR worked for me: * Turn the source map pref off * Open https://tromey.github.io/source-map-examples/simple/index.html * Open devtools * Switch to debugger
My UserAgent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:58.0) Gecko/20100101 Firefox/58.0 This bug also have reproduce on Firefox 58. Browser console is nothing to say, editor just say "loading...".