Google Publisher Toolbar is a Chrome extension that lets those who run Google Adsense on their blog to view up-to-date information about the status of the Ads.
The Toolbar uses the Google Account you are signed in to provide an overview of your earnings and performance, as well as ad overlays that offer in-page reporting and blocking controls.
Setting up the toolbar isn’t an issue, but you might encounter error in the course of properly using it after installation.
How to install Google publisher Toolbar 
It’s only exclusively available in Chrome browser at this time. To use the Google Publisher Toolbar you’ll need to install it and allow it access Google Account associated with your account.
Step 1:
Install Chrome on your system if you don’t have it
Step 2:
Open it, click on the option at the top right hand corner of the browser, and from the drop down menu select More Tools, pointing your cursor to more tools will display other available options from there Click on Extensions.
Step 3:
Below the page, click on Get more extensions to gain access to the tens of thousands of available extensions in chrome store 
Step 4:
By the top left-hand side of your browser input “Google Publisher Toolbar” as your search string.
In front of the toolbar click on Add To Chrome, allow the installation process to complete. You now have publisher toolbar. The Google Publisher Toolbar icon is added to the top right of your browser.
Step 5:
Click the Google Publisher Toolbar icon, to allow access to your account, sign in to the Google Account associated with your account.
From your Chrome window, click the icon in the top right of your browser to view account performance.
This is where you’re likely to encounter a problem. Ordinarily, once you’ve installed the Google Publisher Toolbar, no further action is needed on your part to receive updates to the Toolbar.
If the installation is ok, your adsense performance should display right away. If it shows you code to copy and paste somewhere, then there’s an issue somewhere.
How to correct Google publisher Toolbar Installation Error in Chrome
In a situation where you click on the toolbar icon and what you see is “Copy this code, switch to your application and paste it there” it means there’s error somewhere.
Step 1:
To correct this error, click on option by the top right hand corner
Step 2:
Click on More Tools>Extensions
If “Allow access to file URLS” is unmarked then you’d be seeing error.
To correct the error tick it so as to “allow access to file URLS” after this action the Google Publisher Toolbar will stop showing error or asking you to copy any code.
It should work perfectly well after that.
Thanks for your support.
Advantages of Using Google Publisher Toolbar
This toolbar provides the following features:
An account overview pop-up that you access from your Chrome browser via an icon which sits at the top of the page.
In-site ad overlays provide detailed information about the ads on your site.
The ability to “test click” on ad overlays without those clicks being counted towards ad spam.
An “Ad Details” window – accessible from any overlay – gives you a more detailed view of an ad as well as controls to block an ad, a URL or an ad network, or report a problem with an ad.