Firefox to Block Ads?

Mozilla-security

 
Want to opt-out of advertising based on your browsing habits?  Firefox will soon offer an opt-out for targeted ads delivered to you based on how you surf.

"To put it in layman’s terms, this will let you configure your Firefox browser, having it inform both websites and advertisers that they would prefer to remain private and opt-out of any advertising based on their behavior. This is made possible thanks to a new “Do Not Track HTTP header” which will accompany every click or page view in Firefox." [via ubergizmo]
 
Good news, right?  What are your thoughts?  Do you think that Mozilla, the company behind FireFox, will suffer by cutting a revenue stream?  Let us know in the comments.