Is there an extension (for Chrome or Firefox) that allows viewing of comments only with only a certain number of votes for a post on Google+? I am considering writing one myself, but if it already exists, then there'd be no point.
I don't know about only showing the top rated comments, but there are plenty of plugins that can collapse the comments out of your feed. I think you may have found a great idea for a plugin to write. Just in case you want to test them out, here's a couple of the ones that I found:
- Google+ Ultimate for Google Plus
- Usability Boost for Google Plus™
- Google Plus Enhancer
These are all really customizable, and there may be ways to achieve what you're talking about within them.