Idea for integrating RSS readers with browsers

I started using Google Reader. I added several sites there that I constantly visit. Although they are not small, but they are rarely updated. Except for one - Habr. While I am on this site, read previous posts and write comments, a couple more new posts may be added to it.

As a result, when I open my reader again, I see those new messages that I have just read.

Many RSS readers (not online, for example, like this Google Reader) are integrated into the browser to intercept links to feeds and add them to themselves.
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So let them agree and will continue to monitor the history of the browser, and if they find a match there address with the one that leads to the post in the feed, then immediately mark it read.