1. Replies and More for Google+: Improve Reply and Share Options, Add a Mute Shortcut
"Replies and More" offers a mixed bag of functionality, but it comes recommended with a five-star rating.
As well as adding a notification number to the G+ favicon and keeping the header bar at the top of the page, it brings extra functionality to posts.
Instead of the the "Reply" option, you get "Reply to Author" which automatically adds the +name to your response. This also works if you reply to comments on posts. It also creates a drop down box for the share option, giving you the ability to email, tweet or post to your Facebook wall.
Finally, hitting "m" when you've got a post selected mutes it. Try it -- it's quite satisfying simply "M-ing" those noisy Plussers in your stream!
2. +Photo Zoom: Enlarge Images By Hovering Over Them
This wizzy extension gives you a quick way to enlarge images in your Google+ stream. With a standard install, it will show a larger version of photos when you hover your cursor over them.
You can also change the settings so that a photo will only enlarge if you hover over it for a certain amount of time, or if you press a function key. We'd definitely recommend taking advantage of the customizable settings. The instant no-holds-barred hover can get tiresome when browsing, but is a useful tool when used with discretion.
3. Usability Boost for Google Plus: Change Google+'s Look, Add a Mute Button
This is a good option if you're finding your stream hard on the eye. It changes the appearance of the site by adding a grey background boxes to the posts to make them look more separated. It comes down to personal preference, but you may prefer this developer's version to Google's original design.
Other tricks include a "mute" option at the top of every post (which saves you from selecting mute from the drop down menu) and a fixed menu bar at the top of your display.
4. GPlus+ Search: Search Google+ Public Content
This handy little tool adds an icon to your Chrome toolbar that offers a quick and easy way to search public Google+ content.
Google+'s current search tool is geared to finding users, rather than content, although we do expect that to change in the future.
Once installed you simply click on the icon to search the social networking service for keywords. Search options include "all", "posts" and "profile" as well as other related Google products like Buzz and Reader.
5. Beautify G+: Fix the Left and Right Hand Menus, Remove Some Promo Elements
This extension fixes the left and/or right menus in place, so if you get lost scrolling down your stream you don't have to head all the way back up to the top of the page to navigate to a different area.
In addition, it can hide the automatically generated "Suggestions" that show up on the left of your screen and get rid of the "Go mobile" promo link.
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Source: Mashable