Definition
Trusted URL and Browser Policy Violations is a Setup page that logs instances where browsers blocked content due to Content Security Policy (CSP) violations. It helps administrators identify and resolve issues where custom JavaScript, iframes, or external resources are being blocked by the browser's security policies.
Real-World Example
Users at CloudSync report that a custom Lightning component's interactive chart is not rendering. The admin checks Trusted URL and Browser Policy Violations and finds CSP violation entries showing that the chart library's CDN domain is being blocked. She adds the CDN URL to the Trusted URLs list, and the chart renders correctly on the next page load.
Why Trusted URL and Browser Policy Violations Matters
Trusted URL and Browser Policy Violations is a Setup page that logs Content Security Policy (CSP) violations detected by users' browsers while interacting with Salesforce Lightning pages. When a Lightning component attempts to load a script, stylesheet, image, iframe, or font from an external domain that is not on the org's CSP allowlist, the browser blocks the resource and Salesforce logs the violation. This page gives administrators visibility into exactly which external resources are being blocked, including the source URL, the type of resource, and when the violation occurred, making it the primary diagnostic tool for troubleshooting broken third-party integrations and custom components.
As organizations build more custom Lightning components that rely on external CDNs, APIs, and embedded content, CSP violations become a frequent source of support tickets. Users report blank charts, missing maps, or components that silently fail without obvious error messages. Without this violations log, administrators would be left guessing which external resource is being blocked. Proactively monitoring this page after deployments helps teams catch issues before users report them. However, administrators should not blindly allowlist every blocked domain — each entry is a security decision that expands the attack surface, so violations should be reviewed for legitimacy before adding the domain to the Trusted URLs list.
How Organizations Use Trusted URL and Browser Policy Violations
- CloudSync Technologies — CloudSync's admin investigates user complaints about a broken interactive chart in a Lightning component. She opens Trusted URL and Browser Policy Violations, finds repeated CSP entries blocking cdn.chartlibrary.com for script-src, adds the domain to Trusted URLs, and the chart renders on the next page load — resolving 47 open support tickets in one action.
- VantagePoint CRM — VantagePoint's development team uses the violations log as part of their deployment checklist. After each release, they review new CSP violations to identify any Lightning component that introduced unapproved external dependencies. This practice caught a developer's component that was loading analytics tracking scripts from an unauthorized third-party domain.
- NexGen Insurance — NexGen's security team reviews the Browser Policy Violations page monthly as part of their compliance audit. They cross-reference logged domains against their approved vendor list, and in one audit discovered that a deprecated marketing tool was still attempting to load scripts from a domain that had been flagged in a recent security advisory, prompting immediate removal.