Hey Product Hunt 👋 I'm Diego, the maker behind Njectify. I've always had this habit of tweaking the look and behavior of tools I use every day, mostly SaaS products and legacy systems at work. But doing that properly meant hopping between extensions: DevTools for inspecting, one extension for CSS, another for JS, logs scattered everywhere, and losing progress every time the page reloaded. Njectify puts all of that in one place: a fast visual inspector, a point-and-click CSS editor (hover/focus/active states, breakpoints, gradients, no CSS knowledge needed), a dedicated debug console, and a full IDE built on Monaco (the same editor behind VS Code), right in the browser. You edit live, on any site, and CSS changes hot-reload instantly with zero flash. It's not just for tweaking looks. Because scripts run in the page's own context, already authenticated, you can do things like mirror a SaaS product's internal API calls, build a mutation observer that reacts to the DOM on its own, or add a keyboard shortcut layer to a sluggish internal tool. None of it needs a backend or a deploy, you write the script, bind it to a URL, and it just runs from then on. It took about 6 months to build, and it went through Google's full review process before landing on the Chrome Web Store, so every permission is justified and nothing sketchy is happening under the hood. Would genuinely love your honest feedback, what's confusing, what's missing, what you'd want it to do next. Not looking for votes, looking for real reactions.

Njectify

Edit CSS & JavaScript on any website, live in your browser

Edit CSS & JavaScript on any website, live in your browser