ImgLikeOpera [1] allows turning on/off graphics on web pages in Opera style. It’s license is MPL 1.1/GPL 2.0/LGPL 2.1, as license.txt inside the addon file says (not mentioned on the home page though). Thus, it’s a free addon, right?
Best regards, Dmitri Gabinski [1] http://imglikeopera.mozdev.org/about.html -- http://gnuzilla.gnu.org
