These are the most used extensions and apps dedicated to g+ that I found until now in the chrome web store. Did I miss an extension or made a mistake? Then leave me a comment on the original post. Please share this to help the g+ community.

1. Hover Zoom (215,030 users) –
Enlarge thumbnails on mouse over. Works on many sites (Facebook, Twitter, Google, Flickr, Reddit, Amazon, etc).

2. Google +1 Button (166,957 users) –
+1 and share a web page, anywhere you go on the web.

3. Google+ Notifications (95,554 users) –
View notifications of Google+ activity when signed in, anywhere you go on the web.

4. Extended Share (75,854 users) –
Extends Google+ to share to Facebook, LinkedIn, Twitter, and many more.

5. SGPlus (64,781 users) –
Complete social network integration: post to Facebook and Twitter, see your feeds inside Google Plus, and much more

6. +Photo Zoom (63,099 users) –
Easily zoom photos and profile pics from your Google Plus Stream.

7. Google Translate for G+ (61,938 users) –
Translate your Google+ stream using integrated, inline, Google Translate support.

8. Publish sync for google+ & facebook (56,821 users) –
Provides two-way syncs Google+, Facebook, Twitter, Plurk. It supports article, video, pictures and more

9. Replies and more for G+ (39,455 users) –
Adds reply and reply-to-author buttons to Google+ comments and a number of other enhancements.

10. G+me (35,289 users) –
Collapses the Google+ stream while keeping live updates: collapses posts, hides comments, etc.

11. Surplus (32,103 users) –
Google Plus Integration for Chrome

12. Usability Boost for G+ (24,320 users) –
Greatly improves readability on Google Plus, ability to star posts to read later and some other useful features

13. 1-Up for Google+ (18,368 users) –
Changes your +1 icon on Google+ into a 1-up mushroom from Mario Brothers. Complete with sound!

14. Google Plus Directory (15,601 users) –
Find your G+ is a Google Plus person directory, where you can meet new people, start making new friend circles and more for Google+

15. Google+ Ultimate (15,422 users) –
This extension for Google Plus adds functionatility and themeing for the site.

16. -1 Minus One for G+ (12,306 users) –
Minus one (-1) button in Google+ (Post & Comment), Notifications.

17. Plus Minus (12,087 users) –
Lets you select which Circles show up in your Google+ Stream, allows you to easily mark individual or all posts as read, offers a wide-screen view so you can see more content without scrolling, and loads more posts automatically as you scroll down.

18. More for Google Plus (9,837 users) –
Loads more content as you reach the bottom of the Google+ page.

19. Google Plus News, Blogs, Tips & Updates (7,956 users) –
This is a third party site created to cover latest news, blogs, tips & tricks, howto’s, updates and progress of the upcoming Google+ social network.

20. RSS Share for Google Plus (7,575 users) –
Google+ and Google Reader Integration. ‘Share on Google+’ button on Google Reader. Google Reader in Google Plus.

21. Google+ Tweaks (7,398 users) –
Tweaks to the layout and features of Google+ (Google “Plus”) Full width, thumbnails only, etc.

22. DownloadSupport for Google+ (7,208 users) –
Download pictures and videos on the stream of Google +.

23. Uncircle Inactives+ (6,627 users) –
Google+: Find and Remove Inactive People in Selected/All Circles. Inactivity = No Public/Private Posts At All or Since a Chosen Date

24. Helper for Google+ (6,570 users) –
Add extra functions the Google+. Get desktop notifications on new posts. Share Posts via twitter. Translate posts with Google Translate. Bookmark posts faster for reading later (also to Linked #hashtags. Search in posts and profiles directly from your omnibox.

25. Notification Count for G+ (6,179 users) –
Extension for displaying unread notification count for Google Plus

26. +1 Button (5,560 users) –
Plus one every page you like with only one click, directly from omnibox, without any annoying popup

27. Facebook for Google+ (5,428 users) –
Add your Facebook Stream to your Google+™ Profile 

28. Tweets +1 (5,015 users) –
Adds a +1 button to tweets on

29. G+ Count in Title (4,961 users) –
Adds notification count to the document title in the page tab.

30. Layouts for Google Plus (4,560 users) –
Change your Google Plus background to any image you want. Click the ‘Edit Background’ button in the lower right corner to change…

31. G+ Tweet (4,378 users) –
A full featured twitter client for Google+. View your timeline, url shortening, photo sharing and more…

32. Auto-Colorizer for G+ (4,105 users) –
Colorizes Google+ and Facebook based on the user’s photo.

33. Slinky G+ (3,539 users) –
Smart ,Simple and Beautiful Google +

34. Circle+ (3,487 users) –
Add people to your circles on Google+ from any webpage.

35. G+ Manager (3,445 users) –
Manage your Google plus. Keyboard shortcuts, notify icon, collapse, translate posts and more…

36. GTools+ (3,286 users) –
Adds many useful features for Google+ services. You can : stick the google bar, translate posts, customize notification…

37. Beautify G+ (3,280 users) –
Makes Google+ a little bit nicer to look at.

38. G+ Extended (2,961 users) –
Additional shortcuts for G+. Including +1 (+), share (s) and expand comments (e).

39. Plus One (+1) Button (2,943 users) –
Google +1 button for all websites. Especially those who doesn’t have one installed.

40. Plus One Anything (2,719 users) –
With this extension you are given the ability to +1 almost any webpage. 

41. G+ Stream Pause (2,691 users) – Allow’s you to pause your Google+ stream so you can take your time reading or watching videos posted

42. Share+ Social Buttons (2,687 users) –
Share+ will add a context-link icon below your Google+ post in order to share your post to some well-known social platforms.

43. Google +1 (2,483 users) –
Share the current site with google +1

44. Midnight Theme for Google+ (2,461 users) –
Tired of all that white? The Midnight Theme extension applies a clean, dark theme to Google+. Even your girlfriend will like it.

45. Reader to Plus (2,292 users) –
Provides an way to share your Google Reader’s items to Google Plus easily.

46. G+ Count Favicon (2,154 users) –
Replaces the favicon on with one that shows the current notification count.

47. Stream Filter BETA (1,971 users) –
Gives you the option to filter your stream and track it.

48. G+ Game Companion (1,801 users) –
G+ Game Companion (formerly G+ Notify Circles) is a Google Chrome extension designed to help you with Google Plus games

49. My Hangouts for Google Plus (1,562 users) –
Quick view of all the active hangouts in your stream.

50. Uncircle Uncirclers+ (1,556 users) –
Find & Remove People in your Circles who’ve not Added you Back to their Circles. Unfollow Unfollowers, Uncircle Uncirclers.

51. Color Plus (1,543 users) –
A simple extension that replaces any Google Plus bar with a more colorful alternative.

52. Google Plus Button (1,541 users) –
The extension installs a small icon in your navigation bar to access google plus fast and easy with a single click. The icon opens your google plus page in a new or current tab.

53. Quick Hangouts (1,499 users) –
Adds a link underneath the ‘Start a Hangout’ button to join any active hangouts

54. View original size image (1,443 users) –
View original size image for Picasa. Please use with Google+

55. Gooce+ | Facebook, Linkedin, Twitter (1,385 users) –
Complete social network integration: read and post to Facebook, Twitter and Linkedin, search for people and posts inside Google Plus.

56. Search Extension for Google Plus (1,372 users) –
Search Google Plus (Google+) public contents and profiles online.

57. Golden View for Google+ (1,368 users) –
Google Plus enhancements: (optional) modules: User Mute, Default Circle, Hide Images, Hide comments, & Search w/ Google.

58. Circle Management BETA (1,321 users) –
Have better control managing your circles. Do you have more circles than you can manage? Circle management in Google+ has yet to change. So, I am going to make your circle management easier. 

Currently, this extension will add a search box on top of your circle list (the one that pops up when adding a user to your circles), and allows you to quickly locate a specific circle.

59. G+Twitter (1,286 users) –
Realtime Twitter client for Google+

60. Extended Embed BETA (1,284 users) –
Automatically embed a rich content in Google+ such as flickr, soundcloud, hulu, slideshare, smugmug, and revision3.

61. Share on Google Plus (1,283 users) –
Share any webpage on Google Plus by a single click. You DON’T need to publicly +1 the page to Share it on Google Plus.
(though it says ‘You publicly +1’d this as xxxx’, it is not the case. )

62. Hangout Pad for Google+ ALPHA (1,240 users) –
Working prototype for collaborative coding on Google plus Hangouts. This is ALPHA

63. Google Plus Mania (1,175 users) –
Google Plus Mania is a Web App which feed you with all the latest Google Plus Updates and everything with Google Plus.

64. G++ (1,175 users) –
Make Google+ Awesome by Adding Facebook and Twitter Feeds

65. LiveOn+ (1,055 users) –
Announces live-stream events happening on Google+ via the events feed.

66. Fav+ (1,036 users) –
Easily bookmark your favorite G+ posts.

67. Circlestar for Google+ (1,019 users) –
Star posts in Google+ for later reference, just like you star emails in Gmail. Does not sync across computers.

68. Gif Stopper (1,014 users) –
Stop animated gif images with the escape key. Works with Google+

69. +OneFB: Plus One Button for Facebook (983 users) –
Adds +1 button below each FB post. All articles recommended by +1 button will be appeared on Google Plus profile.

70. Google+ Refined (906 users) –
A selection of CSS changes and features for a more refined Google Plus experience.

71. Google+ Hangout Check (812 users) –
This extension will check for available hangouts in Google

72. Hangout Auto Try Again for G+ (801 users) –
Tired of clicking the try again button for Hangouts? Then install this.

73. G-Minus (783 users) –
Alerts you when you’ve been removed from a user’s Google+ Circles

74. Styling for Google Plus (721 users) –
Uses CSS to customize Google+

75. Skins & Share for Google+ & Facebook (716 users) –
Change the front page’s color of Google + and Facebook. Share content to several websites…

76. Share Widget (663 users) –
Share your thoughts on Google+. Adds a button that opens a popup where you can make a Google+ post.

77. Hide Google+ Notification (631 users) –
Simple extension to hide the little red Google Plus notification from the global google header toolbar.

78. Share Widget for Google Plus (614 users) –
Share your thoughts on Google+

79. Google Plus Colors (564 users) –
Change the colors, the background of your google bar with 11 predefined themes. (

80. PinIt for Google Plus (443 users) –
Put a pin in your favourite post and add it to the sidebar in Google+

81. Everything Went Black (397 users) –
This extension modifies page functionality and certain design elements on your Google+ account.

82. Hangouts Finder (385 users) –
Easily find and share public google plus hangouts.

83. Enlightenment for Google Plus (346 users) –
Enlightenment for Google plus adds a search bar for Google Plus. You can use it to search on Google, Twitter, and the G+ social network. 

84. Tweetify for Google Plus (313 users) –
Make your Google+ streams Twitter-like. Heavily experimental. Compresses posts in your stream to 140 visible characters. Pages of individual posts or profiles are not affected. An experiment in reducing information overload in Google Plus in a very familiar way.

85. AutoSave for Google+ (288 users) –
Automatically save the text, restore it.

86. Favorite G+ Stream (280 users) –
Allow any G+ user to set a Favorite Stream as default. 

87. Trendisimo (257 users) –
Trending topics for Google+

88. KloutPlus (248 users) –
View your friends’ Klout scores on their Google+ profiles. Monitor your own as well.

89. G+ Images Hover Zoom (231 users) –
This extension will enlarge the images shown in Google+ stream when mouser cursor is pointing the image.

90. PlusNotifier (217 users) –
Displays unread notifications count in Google Plus

91. Mute Plus (214 users) – Semi-block people from your main stream using this Chrome extension.

92. Google +1[Plus One] & LIKE in 1 (211 users) –
Recommend any webpage via +1 or LIKE in just 2 clicks using I rec [I recommend]. Simple, Fast and Light weight.

93. Ziplbar Plus (185 users) –
Take your Google+ bar everywhere you go. Never miss another notification. Also, jump to friends using their names.

94. GCview for Chrome (165 users) –
This changes the style of Google +

95. G+? Why not A+? (150 users) –
Favourite G+ extensions combined into one

96. Search+ for Google Chrome (149 users) –
Instantly search Google+ from Google Chrome’s URL bar

97. Google+ Troll Remover (148 users) –
Will help you to avoid trolls on Google+.

98. Star Bookmarks for Google+ (147 users) –
Add the Star functionality to Google+ using Google Bookmarks

99. Stay cool (109 users) –
Remove the Google Plus What’s hot feature. You can open it by clicking the snow flake.

100. Goodbye for G+ Games (55 users) –
A simple script by Jonathan Android to hide the Games button for Google+.

101. Productivity++ (53 users) –

Allows users to hide and show Google+ notifications with one click. It also allows toggling two G+ chat modes.
102. Nonplus (52 users) –
Automute Google Plus stream entries by hashtag.

103. G+ Stats (17 users) –
Easy way to show G+ users most popular posts and photos

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