For each cryptocurrency that you choosed, you will be able to its see price in USD by default, change in the last 24 hours and value of that cryptocurrency in Bitcoin.
You can also see the value of a coin in AUD, CAD, CHF, CNY, EUR, GBP. These options are available in the options page. Price in USD will still be visible below selected currency.
After you have installed extension, right click on extension icon and choose options. There you will see list of coins that are supported and you can check or uncheck every coin that you want. Now coins that you have selected will appear in popup window when you click on extension icon. More Info »
When you click on some coin in a popup window, it will show you Bitcoin value for that coin.
Blue progress bar at the bottom of popup window indicates how much time is left until next update.
Note that in order for changes to take effect, you will need to wait around 5 minutes. Options page will download new results if you access it 10 minutes after you have been there. Between two updates, extension will display results from the last update. This extension uses Chrome storage to save HTML and some other information like when last update happens. So it can decide if difference between current and saved time is less or higher than 5 or 10 minutes.
This extension uses API from coinmarketcap.com website.