I already posted this in the "How To and Troubleshooting" section, but it's probably more appropriate here in the feedback area as a bug request... So sorry for the duplicate post...
It would probably be a good idea to update these in the next release.
Removing the "$.browser" method isn't quite so simple, because using "$.support()" is a whole other concept. I noticed that "$.browser()" is used to construct the admin bar, and specifically targets mozilla. In fact I am getting continuously the following message in my chrome inspector tools when I hover over the admin-bar items:
Uncaught TypeError: Cannot read property 'mozilla' of undefined ---- admin-bar.min.js:1
It will be necessary to target the specific functionality of mozilla that is different from other browsers in order to use "$.support()".