User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a3pre) Gecko/20070309 Minefield/3.0a3pre Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a3pre) Gecko/20070309 Minefield/3.0a3pre If you open a new window (firefox or other programs) above a image displayed in firefox the image gets some artifacts: lines of the image are displaced by 1px. Reproducible: Sometimes Steps to Reproduce: 1. open a image in firefox (with clear cut, vertical lines) 2. open a new window (like a pop up) above them works not with every image, I think (but I am not sure) it must be loaded over a html-file Actual Results: the image gets artifacts Expected Results: no artifacts

I forgot to say, the artifacts are ever at the border of the new image. So you must close or move the new window to see the bug. After moving the window above the artifact, the artifact vanishs.

this is dup of 368116 see: bug 368116 comment #4