Add Chrome mask test to autowebcompat-repro agent#6226
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Pull request overview
This PR adds support for running a “Chrome Mask” (Chrome UA spoofing) experiment as part of the autowebcompat-repro agent flow by provisioning a Firefox profile with the Chrome Mask extension installed and enabling the DevTools MCP privileged-context features needed to manage/verify the extension.
Changes:
- Add
setup_profile.pyto build a Firefox profile and preinstall AMO extensions (used for Chrome Mask). - Extend DevTools MCP server config to optionally enable privileged-context tools + system access env var.
- Update agent result schema and system prompt to include/report
chrome_mask_fixedand document the Chrome Mask procedure.
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| agents/autowebcompat-repro/hackbot_agents/autowebcompat_repro/setup_profile.py | New helper to download/install AMO XPI(s) into a profile and warm-launch Firefox to register them. |
| agents/autowebcompat-repro/hackbot_agents/autowebcompat_repro/result.py | Adds chrome_mask_fixed field to the structured result model/schema. |
| agents/autowebcompat-repro/hackbot_agents/autowebcompat_repro/prompts/system.md | Updates instructions to run the Chrome Mask test only after baseline reproduction and to verify UA spoofing. |
| agents/autowebcompat-repro/hackbot_agents/autowebcompat_repro/devtools_mcp.py | Adds enable_privileged_context option and wires --enable-privileged-context + env var. |
| agents/autowebcompat-repro/hackbot_agents/autowebcompat_repro/agent.py | Plumbs optional chrome_mask_profile through to DevTools MCP config and privileged-context toggle. |
| agents/autowebcompat-repro/hackbot_agents/autowebcompat_repro/main.py | Installs Firefox Nightly and now builds/passes a Chrome Mask preinstalled profile into the agent run. |
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jgraham
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Jun 23, 2026
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suhaibmujahid
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Jun 29, 2026
jgraham
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Jun 29, 2026
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@suhaibmujahid could you merge / enable automerge for this as well, please? |
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The linter errors seem unrelated. |
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This PR adds a script that creates a profile and installs Chrome mask extension from AMO and passes the profile to devtools MCP.