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Why does office 365 hang in Firefox on Windows 10 but not on computer with Windows 7?

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I log in via Firefox to portal.office.com, on my Windows 10 computer, then click on mail or calendar and Firefox hangs - blank screen with the word 'continue' on the tab above. Doesn't happen on my Windows 7 laptop or old XP desktop. How can I fix this?

I log in via Firefox to portal.office.com, on my Windows 10 computer, then click on mail or calendar and Firefox hangs - blank screen with the word 'continue' on the tab above. Doesn't happen on my Windows 7 laptop or old XP desktop. How can I fix this?

Wubrane rozrisanje

Does Firefox just stop there, like it's ignoring a redirect, or does it loop?

Redirects

Double check that Firefox is not set to block certain redirects:

Windows: "3-bar" menu button (or Tools menu) > Options Mac: "3-bar" menu button (or Firefox menu) > Preferences

In the left column, click Advanced. On the right side, make sure the "General" mini-tab is selected along the top.

If "Warn me when websites try to redirect or reload the page" is ticked, clear that checkbox.

Loops

Often a cookie problem. Could you try:

(1) Make sure cookie settings are liberal for testing purposes. See: Websites say cookies are blocked - Unblock them

(2) Remove existing cookies for microsoftonline.com AND office365.com AND office.com -- assuming you do not have any unsaved work pending on the system. Either:

  • right-click (on Mac Ctrl+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 "i" icon in the address bar, then the ">" button, then More Information, and finally the "View Cookies" button

In the dialog that opens, the current site should be pre-filled in the search box at the top of the dialog. Edit that to microsoftonline.com to list that site's cookies, and then remove them individually. Repeat with office.com and office365.com.

Then try logging in again and see whether the redirect is successful.

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Wubrane rozrisanje

Does Firefox just stop there, like it's ignoring a redirect, or does it loop?

Redirects

Double check that Firefox is not set to block certain redirects:

Windows: "3-bar" menu button (or Tools menu) > Options Mac: "3-bar" menu button (or Firefox menu) > Preferences

In the left column, click Advanced. On the right side, make sure the "General" mini-tab is selected along the top.

If "Warn me when websites try to redirect or reload the page" is ticked, clear that checkbox.

Loops

Often a cookie problem. Could you try:

(1) Make sure cookie settings are liberal for testing purposes. See: Websites say cookies are blocked - Unblock them

(2) Remove existing cookies for microsoftonline.com AND office365.com AND office.com -- assuming you do not have any unsaved work pending on the system. Either:

  • right-click (on Mac Ctrl+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 "i" icon in the address bar, then the ">" button, then More Information, and finally the "View Cookies" button

In the dialog that opens, the current site should be pre-filled in the search box at the top of the dialog. Edit that to microsoftonline.com to list that site's cookies, and then remove them individually. Repeat with office.com and office365.com.

Then try logging in again and see whether the redirect is successful.

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Thank you very much, I've just done all that, and have now succeeded in getting to my mailbox. I'll keep the instructions in case it happens again.