Dummy image is not loaded in firefox

Preconditions
User uses Firefox browser
Topic contains post with invalid image link like

[img]http://ya.ru[/img]

Steps to reproduce
User opens topic and clicks on image

Actual result
Invalid image displays as empty rectangle with border
Image is not loaded after click

Expected result
Image with text "Sorry, no image available" should be displayed
This image should be displayed after click on it

Note
Problem is not reproduced on Chrome and IE