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Can no longer ope Outlook in Firefox after 10 years of being okay

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I can no longer open Outlook (Office 365) in Firefox. I reset to original factory setting and was able to open it once but now I keep getting the same error message attached. I get through the login and then it starts "glitching" in the bottom left of the screen while trying to connect.

I can no longer open Outlook (Office 365) in Firefox. I reset to original factory setting and was able to open it once but now I keep getting the same error message attached. I get through the login and then it starts "glitching" in the bottom left of the screen while trying to connect.
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cor-el
cor-el
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What security software do you have?

It is possible that (anti-virus) security software is causing the problem. Try to disable security software temporarily to see if that makes a difference.

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You can reload webpage(s) and bypass the cache to refresh possibly outdated or corrupted files.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

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