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JustZix
Inject CSS & JS into any page — no DevTools needed
JustZix is a free Chrome extension that injects custom CSS and JavaScript into any page using URL-pattern rules. It adds in-tab developer windows — a CSS pane, a JS pane, a JS Console (REPL) and a 6-tab Output Console (console logs, network requests, errors and the GTM dataLayer) — so you can edit, debug and customize sites without DevTools. Hide banners, force dark mode, QA a GTM setup, mark DEV/STAGING environments, or build small page tweaks that persist. No account required, no telemetry.
Hi Product Hunt,
I'm the maker of JustZix — a browser extension for saving persistent CSS and JavaScript tweaks on any website.
I built it because I kept repeating the same workflow: open DevTools, paste a CSS snippet to hide a cookie wall or fix a layout, then lose it after refresh. During QA, I’d also ask developers for small changes like adding a “STAGING” badge or toggling a feature flag — things that often didn’t really need developer time.
JustZix lets you attach CSS and JS to pages using URL-pattern rules, so your tweaks come back every time you visit.
You can use it to:
* add QA badges, warnings, toggles and quick controls
* hide annoying modals, cookie walls or broken layout elements
* test frontend ideas directly on real pages
* debug console logs, errors, network requests and GTM dataLayer
* share rule bundles with teammates using temporary short links
It also brings the DevTools parts I use most directly into the tab: a CSS pane, JS pane, JS Console REPL, Output Console, live object tree, action bar, and a `window.JZ` API for scripting.
A few things I care about:
* free to use
* no account required
* no telemetry
* optional sync
* no email-based identity
* temporary sharing links that expire in 1–48 hours
JustZix is in early access and available now at justzix.com. The Chrome Web Store listing is still pending review, so the current version is distributed directly from the website. Once the store version is approved, I’ll add the official install link here.
I’d love to hear what you’d use it for — QA, debugging, layout fixes, growth experiments, GTM/dataLayer work, or something completely different?
Thanks for taking a look. I’ll reply to every comment today.
About JustZix on Product Hunt
“Inject CSS & JS into any page — no DevTools needed ”
JustZix was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #50 on the daily leaderboard. JustZix is a free Chrome extension that injects custom CSS and JavaScript into any page using URL-pattern rules. It adds in-tab developer windows — a CSS pane, a JS pane, a JS Console (REPL) and a 6-tab Output Console (console logs, network requests, errors and the GTM dataLayer) — so you can edit, debug and customize sites without DevTools. Hide banners, force dark mode, QA a GTM setup, mark DEV/STAGING environments, or build small page tweaks that persist. No account required, no telemetry.
On the analytics side, JustZix competes within Chrome Extensions, Productivity and Developer Tools — topics that collectively have 1.2M followers on Product Hunt. The dashboard above tracks how JustZix performed against the three products that launched closest to it on the same day.
Who hunted JustZix?
JustZix was hunted by JustZix.com. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of JustZix including community comment highlights and product details, visit the product overview.
JustZix.com