Two other threads were posted recently indicating that the normal top bar was missing. One user said going into Firefox's full screen view (F11 key switches between normal and full screen views) would show the top bar, but that's inconvenient. To help you get back in, can you try this from the login page: clearing your Firefox cache and deleting your saved cookies for the site. (1) Bypass Firefox's Cache Use Ctrl+Shift+r to reload the page fresh from the server. Alternately, you also can clear Firefox's cache completely using: orange Firefox button (or Tools menu) > Options > Advanced On the Network mini-tab > Cached Web Content : "Clear Now" If you have a large hard drive, this might take a few minutes. (2) Remove the site's cookies (save any pending work first). While viewing a page on the site, either: * right-click and choose View Page Info > Security > "View Cookies" * Alt+t (open the classic Tools menu) > Page Info > Security > "View Cookies" In the dialog that opens, you can remove the outlook.com cookies individually. Then try reloading the page. Can you log in again? ---- Other Office 365 threads: * [https://support.mozilla.org/en-US/questions/971225 I have to press F11 to get the Send button to show on Office 365 since their upgrade. Any work arounds besides pressing f11] * [https://support.mozilla.org/en-US/questions/971008 I use Outlook Webmail, office 365 for two mailboxes. In one when I send an email it hides the top menu bar where you click send etc, meaning I cannot send email]