Go to this website and click the blue button Add to Chrome available in the top right corner of the screen:
A pop up will appear, asking your permission to add the plugin to your browser:
Click Add extension. Once the installation is completed, the blue button Add to Chrome will change into green Added to Chrome. At the top right corner of the screen, to the right from the URL, the Traffit icon will appear – letter T on a yellow background – and your browser will confirm that the installation was successful:
Your Chrome browser will also notify you about it:
Next, authorize the plugin, (i.e., connect it to your Traffit account).
To do that, log into your account and click the Traffit icon in your browser. Next, click Authorize the plugin and refresh the page (press Ctrl + R on the keyboard):
It's OK if you don't do that. It will remind you about the authorization if you decide to use it for the first time.