New Extension wanted for Fire Fox

I will look at doing this my self i will have to look at the code for the extensions.

But this is what i want it to do.

Be Able to select part of a table and take the values and sum or do an average on them.

At the moment you have to cut paste then do it in Excell or Open Office.

The minutes this will save will be massive in the total added up during the week.

I spend so much time looking at tables of data in browsers and want a sum of a sub set of the data displayed and the only quick way is in a spreadsheet program which defeats the purpose of the browser interface.