what i really want in a browser

1. note taking
the only difference between reading online and reading on paper is that i can conveniently underline and doodle on paper, but not so easily on a web page. what i want is a browser based page editor. conceptually, it shouldn't be hard to build. assuming a web page has a perm link, as most web posts such as blog posts and news articles do, then the task is simply to build a meta/indexing file locally that adds notes to the web page. when the same link is visited and same web page is loaded, the meta file is superimposed onto the web page. however, the fact that many pages get updated frequently might complicate things. but i'm sure there could be a clever way of detecting differences and adding the notes accordingly.

2. horizontal tabbing
i got tired of tabbing. it keeps things neat and opened windows few, but it's really not convenient to have to flip through a stack of vertically stacked tabs. moreover, a lot of sites don't use all the space that our wide screens provide. it'll be awesome if we could have a browser that has a horizontal tabbing function. basically what i need is a browser with its field split, let's say, three ways by vertical borders, each portion including its own address bar. this way i can watch a regular sized video, read a skinny post and write something at the same time. right now i solve the problem by opening multiple windows and have them stack over each other, revealing what i need to see, but as such only one window can be active at a time. and it's annoying.