Did your Firefox just update? You can copy/paste your current version from the "Troubleshooting Information" page. Either: * "3-bar" menu button > "?" button > Troubleshooting Information * (menu bar) Help > Troubleshooting Information * type or paste about:support in the address bar and press Enter The first table has a row for Version (and also should have an "Update History" button, in case you want to see the date of update). Thanks.