Mozilla Firefox 39.0.3 Hotfix Out Now to Patch a Critical Issue in the Built-in PDF Viewer

Mozilla Firefox 39.0.3 update prompts started appearing a few minutes ago via the built-in updater of the software for the aforementioned computer operating system. According to the release notes, this version fixes a critical security issue in the built-in PDF Viewer. All users are urged to update to Mozilla Firefox 39.0.3 as soon as possible in order to patch the critical security vulnerability detailed in the release notes.