Have you tried IE or Edge. I have found anything Microsoft email works better with those two browsers.

Hi MarionFirefox, when you say you deleted History, what kinds of history did you delete? It's pretty common to clear the cache (How to clear the Firefox cache), and the site's cookies, but you shouldn't need to clear everything else.

Since it works after that, your extensions might be "innocent" but it's difficult to say for sure.

One other note: If you are getting a blank page, please make sure the redirect block is turned off:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

(2) In the search box above the list, type or paste access and pause while the list is filtered

(3) If the accessibility.blockautorefresh preference is bolded and "modified" or "user set" to true, double-click it to restore the default value of false

WestEnd said

Have you tried IE or Edge. I have found anything Microsoft email works better with those two browsers.

Yes, I did. Edge works

jscher2000 said

Hi MarionFirefox, when you say you deleted History, what kinds of history did you delete? It's pretty common to clear the cache (How to clear the Firefox cache), and the site's cookies, but you shouldn't need to clear everything else. Since it works after that, your extensions might be "innocent" but it's difficult to say for sure. One other note: If you are getting a blank page, please make sure the redirect block is turned off: (1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk. (2) In the search box above the list, type or paste access and pause while the list is filtered (3) If the accessibility.blockautorefresh preference is bolded and "modified" or "user set" to true, double-click it to restore the default value of false

Thanks for your response. I checked and the accessibility.blockautorefresh' preference was still default (false). I do not get a blank page when I push the login-button in outlook (https://outlook.live.com/mail/inbox). Just nothing happens then, except that I see that some activity occurs and a few URL's appear very quickly. I cannot read them.

Regarding the history: when I cleared the cache only it did not help, clearing history also did not help, only clearing cookies works directly. But I was trying now and I saw that after clearing history and cache only I could log in after I restarted Firefox. I got the link below and I could login. After a few restarts of Firefox the link did not work (Firefox showed "The custom error module does not recognize this error." after logging in. But mysteriously the original link (https://outlook.live.com/mail/inbox) worked again.

https://login.live.com/login.srf?wa=wsignin1.0&rpsnv=13&ct=1562746383&rver=7.0.6737.0&wp=MBI_SSL&wreply=https%3a%2f%2foutlook.live.com%2fmail%2finbox%3fnlp%3d1%26RpsCsrfState%3d42f5894e-b894-aa82-d465-2846423e3e68&id=292841&aadredir=1&CBCXT=out&lw=1&fl=dob%2cflname%2cwld&cobrandid=90015

Hmm, it's puzzling because it works for a while and then stops working. Usually if there were a settings problem, it should behave more consistently.

Users occasionally report problems with staying logged in to sites due to a fluctuating connection. Could you check the setting here:

• Windows: "3-bar" menu button (or Tools menu) > Options
• Mac: "3-bar" menu button (or Firefox menu) > Preferences
• Linux: "3-bar" menu button (or Edit menu) > Preferences
• Any system: type or paste about:preferences into the address bar and press Enter/Return to load it

In the search box at the top of the page, type proxy and Firefox should filter to the "Settings" button, which you can click.

The default of "Use system proxy settings" should piggyback on your Windows/IE "LAN" setting. "Auto-detect" can lead to a flaky connection. You may want to try "No proxy".

Any difference?

jscher2000 said

Hmm, it's puzzling because it works for a while and then stops working. Usually if there were a settings problem, it should behave more consistently. Users occasionally report problems with staying logged in to sites due to a fluctuating connection. Could you check the setting here:

• Windows: "3-bar" menu button (or Tools menu) > Options
• Mac: "3-bar" menu button (or Firefox menu) > Preferences
• Linux: "3-bar" menu button (or Edit menu) > Preferences
• Any system: type or paste about:preferences into the address bar and press Enter/Return to load it

In the search box at the top of the page, type proxy and Firefox should filter to the "Settings" button, which you can click. The default of "Use system proxy settings" should piggyback on your Windows/IE "LAN" setting. "Auto-detect" can lead to a flaky connection. You may want to try "No proxy". Any difference?

Hmm, it's puzzling because it works for a while and then stops working. Usually if there were a settings problem, it should behave more consistently. Users occasionally report problems with staying logged in to sites due to a fluctuating connection. Could you check the setting here:

• Windows: "3-bar" menu button (or Tools menu) > Options
• Mac: "3-bar" menu button (or Firefox menu) > Preferences
• Linux: "3-bar" menu button (or Edit menu) > Preferences
• Any system: type or paste about:preferences into the address bar and press Enter/Return to load it

In the search box at the top of the page, type proxy and Firefox should filter to the "Settings" button, which you can click. The default of "Use system proxy settings" should piggyback on your Windows/IE "LAN" setting. "Auto-detect" can lead to a flaky connection. You may want to try "No proxy". Any difference?

Hi. I have set it to "no proxy", it was on auto-detect. But as the outlook-site is working after the previous changes I will have to wait until it fails again (or forever when all is ok). So I will work for now with "no proxy". PS. I assume it doesn't introduce a security breach. But as this is a home situation I think we did not use a proxy server.