Or make it automatic or at least default for https? If you're using https, the only thing you have to hide is your search term, right? And that's what's being exposed to Amazon, or whoever else is seeing your URL along the way.
If you're using HTTPS, the Referer is blocked by your browser.
If that separate domain can be used in the Chrome URL bar, count me in. Thought it would be even better if it could be done using the main URL in the Chrome URL bar somehow...
If the domain exists it can be used in the Chrome URL bar. Any search engine that puts its queries in the URL can be added manually to Chrome.
The whole point of using POST is to remove the queries from the URL, though.
In Opera, when setting up search engines [which can be used directly in the address bar], you have the option of using POST instead of GET.