Very Good Rated 5 out of 5 stars

This is terrific - it's out of the way for most of my browsing, but there are a couple of things where it's really handy: ipython notebook and evernote. I do write rather a lot in evernote, and had been wishing for <alt>-<backspace>, <ctrl>-a, etc for a while. Here this guys's solved it, and to my amazement even <ctrl>-<space> works to start selection.
Kudos to you Yamamoto-san!

This review is for a previous version of the add-on (4.3.1-signed).