Block JavaScript from using JIT on these sites

Allows you to set a list of site url patterns that specify sites which are not allowed to run JavaScript JIT (Just In Time) compiler enabled.

Disabling the JavaScript JIT will mean that Google Chrome may render web content more slowly, and may also disable parts of JavaScript including WebAssembly. Disabling the JavaScript JIT may allow Google Chrome to render web content in a more secure configuration.

For detailed information on valid url patterns, please see * is not an accepted value for this policy.

JavaScript JIT policy exceptions will only be enforced at a site granularity (eTLD+1). A policy set for only will not correctly apply to or since they both resolve to the same eTLD+1 ( for which there is no policy. In this case, policy must be set on to apply correctly for both and

This policy applies on a frame-by-frame basis and not based on top level origin url alone, so e.g. if is listed in the JavaScriptJitBlockedForSites policy but loads a frame containing then will have JavaScript JIT disabled, but will use the policy from DefaultJavaScriptJitSetting, if set, or default to JavaScript JIT enabled.

If this policy is not set for a site then the policy from DefaultJavaScriptJitSetting applies to the site, if set, otherwise JavaScript JIT is enabled for the site.

Example value:


Supported on: At least Microsoft Windows 7 or Windows Server 2008 family

Block JavaScript from using JIT on these sites

Registry PathSoftware\Policies\Google\ChromeOS\JavaScriptJitBlockedForSites
Value Name{number}
Value TypeREG_SZ
Default Value


Administrative Templates (Computers)

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