You want to be careful of writing your application such that it only supports Chrome, as it's very possible in five or ten years that Chrome will look as archai

You want to be careful of writing your application such that it only supports Chrome, as it's very possible in five or ten years that Chrome will look as archaic as supporting IE 5.5 does today. I'd recommend that you consider instead only supporting IE 10 and/or 11, and prompting users of lower versions to upgrade to any supported browser (e.g. Firefox/Chrome for users who can't upgrade Windows, and IE 10/11 for users on Windows 7/8). Edit: You also want to think about correlation vs. causation -- is it the choice of browser that causes a user to be more engaged, or is is that more engaged users are more likely to choose Chrome for an external reason? (e.g. because they're Google fanboys, or because they tend to have a hundred tabs open, or because they need account sync because they use three different computers, etc.)