Console error in firefox browser: input is undefined

[amitguptagwl]

Describe the bug file open is not working in firefox but working in chrome.

To Reproduce Steps to reproduce the behavior:

1. Go to http://imglab.ml/
2. Click on "open" in the left top menu bar.
3. Try to open previously saved data file
4. See an error in the console

Console Errors

TypeError: input is undefined[Learn More] openfile.js:23:1
readDataFile
http://imglab.ml/js/openfile.js:23:1
this.openFile tags/menu.tag.html.js:3:13 Fe/o<
http://imglab.ml/js/thirdparty/riot+compiler.min.js:2:12067
<anonymous> self-hosted:1085:17 

Device detail (please complete the following information):

• OS: Ubuntu
• Browser firefox

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[vardan10]

@amitguptagwl -- Seems a compatibility issue, has a simple fix. Check this

Will raise a PR for this.