// BROWSER EXTENSIONS
The Chrome bridge — and what's next
FiftyCal's browser companion forwards DOM identifiers, focused selectors, and URLs from the active tab into the desktop session bundle. Without it you still get full-screen capture; with it the bundle gains a second timeline of structured "what was the user actually clicking on" data.
Chrome — FiftyCal Companion
Manifest v3 extension. Pairs over 127.0.0.1:5175
on the local loopback only — no external traffic, no remote
fetch. Runs in every Chromium-based browser (Chrome, Brave,
Arc, Edge).
Firefox — same bridge, packaged for Gecko
Identical DOM-bridge protocol; Firefox WebExtension wrapper. Sign up below and we'll email when the AMO listing goes live.
Safari — App Store distribution
Safari Web Extensions distribute through the macOS App Store. Universal binary alongside the FiftyCal app once the App Store flow is set up.
Privacy posture
- The companion only talks to
http://127.0.0.1:5175on your own machine. Loopback only. - No remote analytics, no telemetry from the extension itself.
- DOM data only flows into the active session — when no FiftyCal session is recording, the bridge sits idle.
- Source for the Chrome extension lives at
/chrome-extension/in the FiftyCal repo (private; published to the Web Store).