» Expected (and so it does with WIN): Big image opens in new TAB
  » Actual:  New TAB opens, but without image view.

Hi, more Details concerning the problem you can see [https://kanboard.discourse.group/t/potential-issue-with-plugin-pitm/3188 here] ! It should be great if you could help us with some diagnostics, for example why the problem only appears with FF on Linux, not with FF on WIN. '''STR''': # Launch Linux FF # Visit [http://newkanboard.bielefeldundbuss.de/?controller=TaskViewController&action=show&task_id=20 this page] "Potential issue with plugin PITM" (Preview [http://newkanboard.bielefeldundbuss.de/?controller=TaskViewController&action=readonly&task_id=20&token=5eb02b71f9570d7fc8da168755974f1fb672cfeeed5bbf0931802ec019d6 here] # Because you will need an Account for visiting account please follow "Konto eröffnen" (Create Account) instructions). # After my approval for the account please visit again "Potential issue with plugin PITM" # Click "1.png" Below heading "Attachments", that should work without problems. # Close image view # Move Mouse pointer to image below heading "My test with a screenshot" – should become magnifier # Now Click that image » Expected (and so it does with WIN): Big image opens in new TAB » Actual: New TAB opens, but without image view. What are your results? FF Linux Problem or something else?