---
title: "BrowserForge: Scaling Web Episodes via Parallel Browser Sandboxes"
source: "arXiv AI/CL/LG（论文）"
source_tier: "t2"
url: "https://arxiv.org/abs/2608.24848v1"
permalink: "https://feed.astralor.com/items/itm_5ada8968a57d03a84ece3d99"
published: "2026-08-25T17:35:42.000Z"
score: 81
channel: "ai"
tags: ["BrowserForge","Mind2Web","OpenAI","Web Agent","Data Synthesis"]
---

# BrowserForge: Scaling Web Episodes via Parallel Browser Sandboxes

## AI commentary

> This paper tackles the real pain point of scarce web agent training data with a pragmatic parallel-sandbox approach, showing substantial gains in scale and performance. It is especially valuable for researchers working on agent data engineering and pixel-based interaction models.

## At a glance

BrowserForge presents a framework that generates web agent training data by driving many browser sandboxes in parallel over the open web. It combines open-web sourcing, sandbox cluster management, and a Proposer-Solver dual-agent loop to turn raw pages into executable tasks and collect verified trajectories, yielding a corpus of 203,238 trajectories, each from a distinct website. Fine-tuning a compact multimodal model on this corpus raises its success rate on live Online-Mind2Web from 25.66% to 33.33%, with controlled analyses confirming that open-web sourcing and broad website coverage are key contributors.

## Key points

- Proposes BrowserForge, a framework that uses parallel browser sandboxes to generate interaction data at scale over the open web
- Builds a corpus of 203,238 trajectories, each from a distinct website, significantly improving data diversity
- Fine-tuned model improves success rate on Online-Mind2Web from 25.66% to 33.33%
- Identifies open-web sourcing and broad website coverage as key drivers of improvement

## Full text

Web agents that act from rendered pixels avoid the fragility and heavy token cost of reading a page's HTML or accessibility tree, but training them depends on large amounts of high-quality interaction trajectories, and how to produce such data at scale remains an open problem. Public datasets typically contain only a few thousand trajectories drawn from a fixed and narrow set of websites, and even recent automated synthesis pipelines stay bound to predefined site lists or tutorial sources, so the number of distinct websites the agent ever sees barely grows. We present BrowserForge, a framework that generates web interaction data at scale by driving many browser sandboxes in parallel over the open web. BrowserForge couples three components: an open-web sourcing stage that exposes the agent to hundreds of thousands of real, openly reachable websites; a sandbox cluster manager that schedules hundreds of concurrent browsers with high utilization; and a Proposer-Solver dual-agent loop that turns a raw page into an executable task and then collects a verified trajectory for it. A rule-plus-model cleaning pipeline removes failed runs and rewrites the surviving reasoning into a single unified chain-of-thought style. Page structure such as the accessibility tree is used only as a synthesis-time signal; the agent we train and release acts purely from the screenshot. The resulting corpus contains 203,238 trajectories, each collected from a distinct website, larger and more diverse than prior trajectory datasets. Fine-tuning a compact multimodal model on this corpus raises its success rate on the live Online-Mind2Web from 25.66% to 33.33% and consistently improves step accuracy on the static Multimodal-Mind2Web, with the gain growing as the corpus scales. Controlled analyses further confirm that open-web sourcing and broad website coverage are key contributors to the observed improvement.

---

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