I was able to fix the bug I noted by changing the "keywords" preference for this script (under about:config) to "google.com/calendar,mail.google.com,docs.google.com" So far it seems to be working well. It's a good script except for that bug.

This script messes up the main google search page. When you do a search with "mail" in it or go to a link with "mail" in the URL, it triggers the script, which tries to redirect to https:, which doesn't work and redirects you to the google home page.