OWA is for company email access. https://www.techtarget.com/searchwindowsserver/definition/Microsoft-Outlook-on-the-web-formerly-Outlook-Web-App-OWA

Your company should have OWA access site. Outlook.com is where you and I go to access our personal email.

Here is a random company OWA site. see screenshot

When I type in outlook.com it takes me to https://outlook.live.com/owa/. I tried entering https://outlook.live.com and it takes me back to https://outlook.live.com/owa/.

I am at home trying to access my personal email accounts.

You can check for issues with Total Cookie Protection.

• https://support.mozilla.org/en-US/kb/total-cookie-protection-and-website-breakage-faq
• https://support.mozilla.org/en-US/kb/introducing-total-cookie-protection-standard-mode

If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block content (Adblock Plus, NoScript, DuckDuckGo PE, Disconnect, Ghostery, Privacy Badger, uBlock Origin) always make sure such extensions do not block content.

• make sure your extensions and filters are updated to the latest version
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Firefox shows a purple shield instead of a gray shield at the left end of the location/address bar in case Enhanced Tracking Protection is blocking content.

• click the shield icon for more detail and possibly disable the protection

You can check the Web Console for relevant-looking messages about blocked content.

• https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop
• https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection
• https://support.mozilla.org/en-US/kb/trackers-and-scripts-firefox-blocks-enhanced-track

You can try these steps in case of issues with webpages:

You can reload webpage(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings).

"Remove the Cookies" for websites that cause problems:

• Settings -> Privacy & Security
  Cookies and Site Data: "Manage Data"

"Clear the Cache":

• Settings -> Privacy & Security
  Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear

• https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox
• https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or userChrome.css is causing the problem.

• switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

• https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

• https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop
• https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection
• https://support.mozilla.org/en-US/kb/trackers-and-scripts-firefox-blocks-enhanced-track

Yeah, definitely need to clear your cache. Also, flush your dns in the browser and windows. https://blog.hubspot.com/website/flush-dns When you go to login.live.com what happens? see screenshot

I've always used my bookmark that points to login.live.com. I see that it does go to https://outlook.live.com/owa/ when I type in outlook.com, but when i click sign in it goes to https://login.live.com. Just bookmark login.live.com and you should be okay. You may also want to try with Firefox in Safe Mode. There may be an add-on in the way.

After updating Windows today, I was finally able to sign in to Outlook. I am still confused as to why it only affected Firefox and no other browser that I use...

These are rather generic suggestions, but let's see if any of them help:

When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(1) Clear Firefox's Cache

If you have a large hard drive, this might take a few minutes.

(2) Remove your Outlook mail site cookies (save any pending work first). While viewing a page on the site, try either:

right-click a blank area of the page and choose View Page Info > Security > "View Cookies" (menu bar) Tools > Page Info > Security > "View Cookies" Click the padlock or globe icon in the address bar, then the ">" button, then More Information, and finally the "View Cookies" button

Regards, Peter

Mark it as resolved and have a nice day.