Just crashed trying to type this post. Redoing (quicker this time).
If no one else is getting the blue Chrome-screen of "Oh Snap!" I guess I'll have to start looking at browser extensions and addons, then. Thanks for checking.
In case it matters, I'm using Mobileread's middle-of-the-road "Standard" message interface setting (miscellaneous options) as opposed to the Basic or Enhanced Interface (full-blown WYSIWYG) options.