+Comment Toggle, hide/show comments on Google+.

+Comment Toggle hides any comments to posts within your Stream and makes them available if and when you actually want to see them.

Since Google+ page structure is quite complicated and heavily powered by JavaScript there may be some errors or unfixed bugs. If you find one, please drop me a note.

About the required permissions:
The extensions needs access to the pages on plus.google.com to integrate the JavaScript necessary to hide your comments. The extension operates entirely within the bounds of your browser and does not collect any information. All it does is modifying the page's source code to hide any comments.

Click here for Extension.