NoScript is a great customizable addon to allow\block the scripts you want for each website. It's quite useful when browsing random unsafe ones or to stop annoying ads.

Maybe an issue is that you don't always know what's good and what's not and have to fiddle with the permissions for each first access. Also, it can be a pain when switching sites during payments, until set up properly.

IMO it should come with basic important rules for the most common\important sites\services.

Lately, however, I'm getting again the old bug that keeps tabs stuck in loading until I disable\re-enable the addon. I hope it will be fixed.