I went through the pain period of noscript but still couldn't stick with it. I had to be constantly mindful every time I buy something online. The process would half-fail at some stage and then I have to start hunting for which domain is the one that's essential for the checkout to complete.

This is not NoScript's fault of course. Some websites are including 20-30 different domains (check out maperformance.com for example) and picking and choosing to get something to work is a nightmare.