It quite is. Transfers get shown on the portfolio page, so if you see a transfer of shares in and a transfer of money out around the same time, you can quite safely assume that was the price. But in my case I bought two different shares at the same time from the same person, and you would have never a way to know what pays what. That's why the only workaround is probably to offer the possibility to manually specify what the price was.
If you want to change the source code I could try to walk you through.
It's all in the file
background.js in the function
howmuchspent()Just insert such a line of code:
if (id=="THE_SHARE") sum.buy+= 232.50
... just before this line:
sum.sum = sum.buy+sum.fee-sum.div
Replace
THE_SHARE with the ticker of the shares and
232.50 with the total BTC amount you paid for them.
Make sure to reload the extensions for the changes to take effect.
