Image still loaded in background

What steps will reproduce the problem?
1. open website 
2. website images replaced by extension, in background images still downloaded
3. website finish loading, images replaced, there are still images downloaded 
in cache

What is the expected output? What do you see instead?
2. website images replaced by extension, in background images not downloaded
3. website finish loading, images replaced, no images downloaded in cache

What version of the product are you using? On what operating system?
ver 1.5.2 (from google chrome web store)
win 7 pro

Please provide any additional information below.
images must not downloaded in any way and no images should can reach cache.

i did double check if it really does replicate the problem.
here is my method:
1. clearing cache
2. while loading the page using "inspect element" to see what files is being 
downloaded
3. after page finish loading, i check the cache

after replicate this method on many site, my result are the same images are 
downloaded, it supposed to blocking images from downloading.

Original issue reported on code.google.com by cabang.d...@gmail.com on 4 Jun 2014 at 5:27

solmri / wizmage

Image still loaded in background #1