Seems to be working, but does it actually prevent images from downloading, or is it only hiding them?

junk

It does not block mozilla.org images but I'm using it on other websites that I want control on loading images and it's working.

Doesn't work on vers 57 of Firefox

When I'm connected to my yahoo mail, when I click on spam or trash, there is a video in HTML5 that was automatically displayed, it's either videos of news or ads that I did not want of course, they are unwanted, and impossible to block them with adblock extensions for firefox.

Well with this extension these videos of ads no longer appear they are blocked in my yahoo mail! Thank you! But before, for that, it is necessary to make a setting in the parameters of this extension:

- Check in the options of the extension: Block hide all frames (HTML iframe element) activate this option.
By cons once this option enabled, the problem is that on some HTML chats, like this one http://dbsuperpw.chatango.com/ messages on this chat no longer appear at all, the page is white! It's shame because otherwise this extension is the best, I tested dozens of other extensions adblock and none could block me these videos untimely in my yahoo mail!
-At the developer: If you can just update your extension so that the messages in the HTML chats are visible again, it would be great and the best!Otherwise thank you again for your extension, which is the only one to block HTML5 videos!

The addon describes itself as an image blocker, but in early tests images are only blocked a few seconds after the page has fully loaded. This does not reduce bandwidth nor does it provide a clean user experience.

Tested with Firefox 54 (32-bit).