Earlier quoted context omitted.
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
The same benefits that having multiple tabs of code windows is better than multiple separate windows. 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…
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.