version
Pin an older major version.
Use it for: Reproducing a bug on an older browser, keeping a scraper on a known-good build while you test the new one, or matching a customer's browser.
Browsers: Google Chrome, Camoufox.
Details
- Type:
string - Default: none (latest stable)
- Example:
{"version":"152"}
Request a retained previous major, e.g. "152". The majors available right now are listed on the browser's page. A major no server in the fleet has returns 400 {"error": "invalid_version"} with the majors you can pin in message, rather than silently running a different version; one that exists but has no free server right now returns 503 version_unavailable.
Previous majors rotate out automatically: Chrome keeps its two most recent previous majors and drops the oldest within about a day of a new stable release; Camoufox keeps recent majors plus long-term ones. Read the live list rather than hard-coding a number. Send either version or a pre-release channel, not both: together they return 400 (channel: "stable" with a version is fine).
Used in
- Case 3: Stable, beta, dev and an older major: four Chromes side by side
- Pin an older Chrome major (156)
- Camoufox: pinned version, macOS persona, no images
All options: launch options.