mozilla/Addon-Tests — pull request #547 by zacc (2012-08-07 20:11:09+00:00)
Title: Add wait for lightbox to be visible

As this is an ajax function I added an explicit wait for the element to be visible.
Couldn't replicate it locally but the visible state we are waiting for is not complex and should stabilise the test_navigation_buttons_for_image_viewer test.