Kobo Price wót foton

Kobo shows different prices for the same book depending on your country.
This extension fetches prices from every Kobo store, converts them to
USD using today's exchange rate, and displays them sorted from cheapest
to most expensive.

1. Go to any ebook or audiobook page on kobo.com
2. Click the PRICES button in the bottom of the screen
3. A panel expands showing a country list with checkboxes — deselect
   countries you don't care about
4. Click Load prices and wait for all prices to load (progress is
   shown as a percentage)
5. The list is sorted by converted USD price — click any country name
   to open that store's page for the book
6. Change your billing address to the cheapest country and check out