I published 'Country of Origin : India' browser extension a year ago[1][2] which whitelists made in India products on Amazon(.in) by hiding others. As a research to find if people are really willing to put money where their mouth is, But the latest trade data shows that in-spite of anti-China sentiment being all time high; People are not reflecting it in their purchases[3].
Perhaps it would be different in a country with higher purchasing power, There are other extensions which labels USA, UK etc. which might deserve your funding. But there might not be an extension which blacklists a particular country and wouldn't be surprised if it's against ToS.
[1] Firefox: https://addons.mozilla.org/en-GB/firefox/addon/country-of-or...
[2] Chrome: https://chrome.google.com/webstore/detail/country-of-origin-...
[3] https://economictimes.indiatimes.com/news/economy/foreign-tr...
I've managed to spread this habit to a few of friends of mine but for the most part most don't seem to care. Often the reason being it's just cheaper to buy Chinese made.
Human greed knows no bounds. Most people seem happy to put their head in the sand. I feel with time this type of movement can grow stronger though.
Good point about browser fingerprinting.
I also do 3 whenever I get a chance, which is rare btw.
2. Going to fund the development (since I can't do this myself) of a browser plugin to help people find non-China goods on Amazon easily. Just two features: Remove Chinese origin items from the search list, and display a warning on the item page when it's made in China.
3. Support Tibetans by buying things they make, visiting their businesses etc.