**Found in** * Firefox Enterprise 149.0a1 (2026-02-21) **Tested platforms** * Affected platforms: Windows 11/ MacOS 15 / Ubuntu 24.04 **Steps to reproduce** 1. Open Firefox Enterprise. 2. Log-in to https://stage.fx-enterprise.nonprod.webservices.mozgcp.net using valid credentials. 3. Set the _BlockAboutSupport_ policy (or any other page blocking policy) to **true**. 4. Navigate to the blocked page (about:support in this case). **Expected result** * The user is presented with an error page which states "This website has been blocked by your Organization...etc" **Actual result** * Page is blocked but blank. **Notes** * This also occurs on non-internal pages.
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**Found in** * Firefox Enterprise 149.0a1 (2026-02-21) **Tested platforms** * Affected platforms: Windows 11/ MacOS 15 / Ubuntu 24.04 **Steps to reproduce** 1. Open Firefox Enterprise. 2. Log-in to https://stage.fx-enterprise.nonprod.webservices.mozgcp.net using valid credentials. 3. Set the _BlockAboutSupport_ policy (or any other page blocking policy) to **true**. 4. Navigate to the blocked page (about:support in this case). **Expected result** * The user is presented with an error page which states "This website has been blocked by your Organization...etc" **Actual result** * Page is blocked but blank. **Notes** * This also occurs on non-internal pages. (using _WebsiteFilter_ to block a page then trying to access it won't show error message)