hypothes.is sidebar is an open source annotation tool in a layer above web content. Read about it at .

hypothes.is is available as bookmarklet or a Chrome extension. Here, the bookmarklet is loaded by the script.

By default, it loads on wikipedia. Edit the list of websites to have it open anywhere.

Note: Avoid http*://* as embeded websites (as iframes) will call the function many times on a webpage, leading to memory difficulties.