Liberals Are Becoming Capitalists

The following reminds me of the “If you ignore me, you're violating my rights!” school of modern liberalism:

The Mozilla Foundation and its Commercial arm, the Mozilla Corporation, has allowed and endorsed Ad Block Plus, a plug-in that blocks advertisement on web sites and also prevents site owners from blocking people using it. Software that blocks all advertisement is an infringement of the rights of web site owners and developers. Numerous web sites exist in order to provide quality content in exchange for displaying ads. Accessing the content while blocking the ads, therefore would be no less than stealing. Millions of hard working people are being robbed of their time and effort by this type of software. Many site owners therefore install scripts that prevent people using ad blocking software from accessing their site. That is their right as the site owner to insist that the use of their resources accompanies the presence of the ads.

Are advertisements aimed at people trying to ignore them worth anything? I'm reminded of Usenet trolls trying to evade killfiles.