Block prompt inject & cut token costs for AI browser agents
AI agents browsing the web have a problem: they read everything — cookie banners, hidden instructions, dark patterns — and can't tell real content from a trap. Agent Browser Shield sits between your agent and the web, stripping prompt injections, masking PII, removing dark patterns, and filtering page noise that burns tokens. Free, source-available, works with browser-use and Browserbase.
Hey PH! 👋 Britt from PixieBrix here.
We've been building browser tooling for enterprise teams for years, and when we started seeing AI agents get deployed at scale to browse the web, we noticed a gap: agents have zero protection from the stuff (most) humans have learned to watch out for.
Prompt injection is OWASP's #1 AI security threat — and it's trivially easy to embed hidden instructions in a webpage that your agent will follow without question. On top of that, most pages are full of junk (cookie banners, footers, chat widgets) that your agent reads and pays for in tokens.
Agent Browser Shield is our answer: a free, source-available browser extension that strips all of that before the model sees the page. We built it in the open because this is an evolving problem — new dark patterns, new injection techniques — and no single team can keep up alone.
Would love your feedback on what to build next. And if you're running browser agents in production, let us know what failure modes you've hit because we want to keep building and write better rules to make this even better.
GitHub: https://github.com/pixiebrix/age...
About Agent Browser Shield on Product Hunt
“Block prompt inject & cut token costs for AI browser agents”
Agent Browser Shield launched on Product Hunt on June 5th, 2026 and earned 105 upvotes and 12 comments, placing #11 on the daily leaderboard. AI agents browsing the web have a problem: they read everything — cookie banners, hidden instructions, dark patterns — and can't tell real content from a trap. Agent Browser Shield sits between your agent and the web, stripping prompt injections, masking PII, removing dark patterns, and filtering page noise that burns tokens. Free, source-available, works with browser-use and Browserbase.
On the analytics side, Agent Browser Shield competes within Browser Extensions, Open Source, Artificial Intelligence and GitHub — topics that collectively have 586.1k followers on Product Hunt. The dashboard above tracks how Agent Browser Shield performed against the three products that launched closest to it on the same day.
Who hunted Agent Browser Shield?
Agent Browser Shield was hunted by Brittany Joiner {Britt the Builder}. 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 Agent Browser Shield including community comment highlights and product details, visit the product overview.
Brittany Joiner {Britt the Builder}