Now, I haven't worked on web in a while, but what advantages does having an in IDE browser of a random provenance (it trails Chromium by 2-3 weeks) vs using a known version in a separate window beside it?
edit: spelling
edit: spelling
When i'm debugging/developing/whatevering code that is going to run the same in all supported browsers, doing it in the editor directly allows me to switch tabs back and forth quicker and easier than having them as separate windows.
When i'm working on my laptop without any additional screens, being able to keep the view of the page on the same screen at the same time as the code is hugely beneficial.
When i'm at home I still tend to use a separate instance of the browser to "preview", but I still drop into the embedded one because the keybinding is so fast and easy to take a quick look then close the tab.
Plus being able to open bookmarks to random documentation websites and see the docs in the most up to date format in their "correct" formatting right in the editor is a huge bonus too.
Completely off-topic remark: I always find it funny that Web is hailed as the Write Once, Run Everywhere there is a browser, but then words "supported", or "compatible" start cropping up.
Really any more the only things that aren't "cross-platform" are bugs, and very new stuff.