Screenshot does not work in offline editor

Bug reports
1

Please fill out these questions for all feature requests and bug reports. If you're requesting a feature, please let us know why this feature is important or useful, not just what it should do.
Thanks!

  1. What browsers show this problem?
    Firefox

  2. Please share an example project (if possible).

  3. Describes the steps to reproduce this issue.
    Download and open Snap offline editor.
    Shift click on Snap logo and click on Switch to dev mode.
    Right click on the gray background
    Click on screenshot...

  4. What does Snap! currently do?
    It does nothing.
    JavaScript console shows this error:

SecurityError: The operation is insecure. morphic.js:12498
  1. What should Snap! do instead?
    Open a new tab with the screenshot
2

Also, screenshot using the online Snap editor in Chrome browser opens a blank tab.

3

thanks, dev mode features are for ... development and not features for consumers.