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Can't log on to my banking website(M&T) but I can in Internet Explorer. Happened within the last week or 2.

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New User

Can't log on to my banking website(M&T) but I can in Internet Explorer. Happened within the last week or 2.

Can't log on to my online banking site, but it works in IE: https://onlinebanking.mandtbank.com/SignOn.aspx https://www.mtb.com/personal/Pages/Index.aspx

Gives me a system error(no error code)

20 REPLIES
Mozilla Support Contributor

Re: Can't log on to my banking website(M&T) but I can in Internet Explorer. Happened within the last week or 2.

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. In this case, you might need to do this for both sites.

(1) Bypass Firefox's Cache

Use Ctrl+Shift+r to reload the page fresh from the server.

(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")

(2) Remove the site's cookies (save any pending work first) using either of these. While viewing a page on the site:

  • right-click and choose View Page Info > Security > "View Cookies"
  • Alt+t (open the classic Tools menu) > Page Info > Security > "View Cookies"

Then try reloading the page. Does that help?

New User

Re: Can't log on to my banking website(M&T) but I can in Internet Explorer. Happened within the last week or 2.

Nope. Tried it, that didn't work.

Mozilla Support Contributor

Re: Can't log on to my banking website(M&T) but I can in Internet Explorer. Happened within the last week or 2.

Could you describe the error message in more detail? If it can't be copied and pasted, it might be helpful to attach a screenshot (use the "Browse" button below the text box). This article might help: How do I create a screenshot of my problem?

Site Moderator

Re: Can't log on to my banking website(M&T) but I can in Internet Explorer. Happened within the last week or 2.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

  • Do not click the Reset button on the Safe mode start window or otherwise make changes.
New User

Re: Can't log on to my banking website(M&T) but I can in Internet Explorer. Happened within the last week or 2.

Same problem here. (windows xp/firefox 17.0 beta channel) Safe mode does not work. This has only been an issue for like 3 weeks.

New User

Re: Can't log on to my banking website(M&T) but I can in Internet Explorer. Happened within the last week or 2.

System Error:


 	We're sorry. An error occurred while processing your transaction request. If you continue to receive this message, please call us at 1-800-790-9130 and we will be happy to assist you. Our representatives are available Monday - Friday, 8 am - 9 pm, Saturday and Sunday, 9 am - 5 pm.

To assist our Telephone Banking Representatives in diagnosing this problem, please be prepared to describe what you were doing prior to receiving this message. In some cases, an error code may appear in red below. Please provide this code to our representative when you call.

We appreciate your patience and apologize for the inconvenience.


The system error is from the banks page.

New User

Re: Can't log on to my banking website(M&T) but I can in Internet Explorer. Happened within the last week or 2.

Works now in beta 18,

New User

Re: Can't log on to my banking website(M&T) but I can in Internet Explorer. Happened within the last week or 2.

I have had the same problem. I contacted the bank and they said that firefox 17.0.1 did not have the necessary security level, that I should use the older version version 3.6 !!!!! When I try to log in to the site it goes blank again with NO error message.

Mozilla Support Contributor

Re: Can't log on to my banking website(M&T) but I can in Internet Explorer. Happened within the last week or 2.

Hi jumbuc, your bank's advice is ridiculous. Perhaps what they meant is that they require certain add-ons and those are not compatible with Firefox 17? Either way, have you tried using a different (but equally up-to-date) browser?