Lately, whenever I've been wanting to make some changes to a site, I've been writing browser extensions instead of userscripts. It's only a little bit clunkier

Lately, whenever I've been wanting to make some changes to a site, I've been writing browser extensions instead of userscripts. It's only a little bit clunkier to get started, but the interface is a lot more supported and documented and has a ton more features. It's also much easier to use with source control, code editors, unit tests (well probably, haven't tried that yet), and other development tools. Plus if it ends up being really useful, you can publish it to the extension store for others to use easily as well.