Color Picker v0.1.2 
Color Picker is handy addon that let you easily search for your desired color via an stylish popup.
Simply click on the toolbar icon to view the UI. Once the UI is shown you will see a popup with 4 different sections. On the top, there is a toolbar with 3 buttons. In the middle, there is a big icon (color-palette icon) which can be used to render the native color picker UI. Click on this icon to pick a new color.
Please note that, depending on your browser and OS, the native color picker UI may vary significantly. Once you chose a color, the table on the right-side will be updated with color values in six different formats. For the first time when you open the color picker UI, please click on the "Basic colors" section once, otherwise the addon will not be able to select and save your color.
At the bottom of the UI, you will see a table with all the selected colors in solid-circles. If you click on a circle, the current color will change to the selected circle color. Moreover, if you want to delete all circles, pleased press on the - Clear History - button at the top toolbar.
Note: this add-on is NOT designed to pick colors from your screen (i.e. web pages). It just let you choose and copy colors from its UI.
Note: to report bugs, please fill the bug report form in the addon's homepage.