The AdSense Notifier is a great tool that allows you to track your earnings right in your Firefox browser. Using this tool can show you your earnings to date, as well as Impressions, Clicks, Click Through Rate, Cost Per Impression, and Revenue Per Click.

I love it. I used to have the bad habit of constantly checking on my AdSense earnings by going to Google, and this has helped me limit that time-wasting activity. I only have a few minor gripes about the tool. One being that it can only refresh every 15 minutes at a minimum, so it is not quite real time. Two is that it has went down on me before; all of the readouts went to 0 for a few hours.

The only requirement is that you have the Firefox browser installed. I recommend it over Internet Explorer as it is more secure and it has many great extensions available besides the AdSense Notifier. You can get Firefox at GetFirefox.com, and the AdSense Notifier is at: AdSense Notifier.