The browser is a programmable runtime, not just a viewer
Bookmarklets — JavaScript saved as a bookmark, built by asking Claude to inject a UI onto a page — turn the browser bar into a personal toolbox with zero installs or servers.
Martijn Verbove · Aug 2026Where this came from · 1 post
I’m turning my bookmark bar into a personal toolbox. Bookmarklets are just JavaScript you save as a bookmark. Click one and it runs locally on the page you’re on. No installs, no server, no data leaving your machine. Paradigm shift: your browser isn’t a viewer. It’s a programmable runtime. First two I built: • Remove spam followers on X • 1-click bulk delete LinkedIn invites from recruiter/agency spam Build yours: 1. Open the page you want to automate 2. Tell Claude what you want to automate 3. Discuss the UI you want (buttons/filters/inputs) 4. Ask Claude to inject that UI into the page 5. Drag the “Save to bookmarks” link/button from that UI to your toolbar (now it’s a 1-click tool) Bookmark bar = workflow layer.