Quick Calculator is an incredible extension for Firefox that lets you quickly sum up and count values on webpages. It works the same as the feature found in Microsoft Excel.
Quick Calculator works well with the Ctrl+Click feature of Firefox that allows you to select multiple table cells. Try it out now on any web page with lots of numbers!
Quick Calculator allows you to choose by right click on descktop a calculation for counting, sum, average, min and max functions.
Install and try it out!
1) plugin works for data in table cells only
2) It reads digits with comma by american standard.