How about these sentence?
Adblock Plus is an open-source project addressing the problem of annoying and intrusive online advertising by putting users back in control.
by putting users back in control ---> by putting users in control
Users might not have originally the control of the Internet and then lost it. so I think "users have a control" or "gain control" is proper expression, not "back"
and I thought the meaning of 'control' as well.
Annoyed by adverts? Troubled by tracking? Bothered by banners? Install Adblock Plus now to regain control of the internet and change the way that you view the web. You can also choose from over forty filter subscriptions to automatically configure the add-on for purposes ranging from removing online advertising to blocking all known malware domains.
I don't think users can gain or regain control of the Internet.
The concept of ‘control’ should be able to change a target directly or indirectly to the way that controler want to change. But Adblock Plus actually can’t change the Internet including ads, contents, etc. with ad-blocking software we can just redesign downloaded webpages on their local computers. in addition No one is in control of the Internet. this sentence is one of the basic philosophy of the Internet.
So, the new texts below is very good on the new homepage
Fully customizable — you are in control