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AdBlock is one of the most popular ad blockers worldwide with more than 60 million users on Chrome, Safari, Firefox, Edge as well as Android.

We have calculate that one of our site loss almost $10,000 each year because of AdBlocker.

Simply what they do is, they remove the advertisement which are on our website when a user who use Adblocker visits.

So as a third party, they change the website content just before display it to the user.

Is it legal? Can't we get a legal action about AdBlocker as web masters?

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    I'm not sure that they are a "third party", as such. Nothing (?) is routed through their servers; they just provide a tool that runs on the user's computer and which provides filtering at the user's end, no different to any tool that I might legally write myself (had I the skill). And no different (?) to me simply going to make a cup of tea while the advert plays, or choosing not to look at a particular part of the screen. – owjburnham Oct 1 '18 at 10:02
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    Your calculation of "loss" appears to mean "we are prevented from earning because customers who have not agreed to a transaction are allowed to avoid it." If that holds up, burglars could sue the police for causing loss of earnings. – Tim Lymington supports Monica Oct 1 '18 at 10:13
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Can't we get a legal action about AdBlocker as web masters?

No. I assume that by "web master" you mean a server admin who contracts with entities which are seeking to advertise their goods and services.

An advertiser pays the server to transmit (or send(), in terms of a socket API) certain content to whoever submits a GET or POST request ("the client"). The scope of the contract ends there, and the end consumer or client is not a party to that contract. Any point beyond the server admin's routers, it is perfectly lawful for end users to run some program on the client side where the purpose of that program is to (1) parse any packets received in the client socket, (2) filter out some of it, (3) and forward the rest to a browser.

Bringing legal action against AdBlocker would be somewhat akin to suing producers of TV remote controls under the allegation that the mute button functionality blocks advertisement content.

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