// Topic cluster · 9 live guides
Permissions, privacy disclosure, content security, local data handling, and safer browser-extension design.
Start with the pillar guide: How to Write a Chrome Extension Privacy Policy
Build Chrome extension message handlers with sender checks, bounded runtime schemas, narrow operations, asynchronous responses, and no arbitrary privileged commands.
Understand isolated-world JavaScript, shared DOM, page-main-world bridges, untrusted page data, and lifecycle cleanup for Chrome content-script interfaces.
Find Manifest V3 remote executable code in packaged files and dependencies, separate data from logic, and remove CDN imports or downloaded code before submission.
Configure Manifest V3 extension CSP, distinguish defaults from the allowed minimum, package scripts locally, and diagnose blocked scripts and network requests.
Prepare consistent Chrome Web Store privacy fields from the release manifest and actual data flows, including local processing and remote-code declarations.
Write an extension privacy policy from actual data flows: local processing, sync, requests, retention, deletion, third parties, and Chrome Web Store disclosures.
Build an optional-permission flow that explains access, requests it on user interaction, handles denial and revocation, and keeps grants separate from settings.
Understand Manifest V3 host permission scope, content-script matches, activeTab, cross-origin requests, and why URL paths do not limit host grants.
Map Chrome extension permissions to real features, choose activeTab or persistent site access, and review grants, data flows, and release warnings.