Firefox Community Forum

Hello,

When I open the developer tools (using F12) and I check the disable cache checkbox of the network tab, I get CORS errors saying that `Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://<my-resource>. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).`.

From my understanding, since the requests triggering the errors have the `Cache-Control` header set (due to the cache disabling), these requests do not qualify as simple requests (https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#simple_requests). That’s why the server (AWS CloudFront) does not return CORS headers. However, I do not understand why Firefox did not send preflight requests (https://developer.mozilla.org/en-US/docs/Glossary/Preflight_request) in these cases.

Did I miss something? Or am I hitting a bug in Firefox?

Regards

My WSJ.com user info correctly loads the Wall Street Journal front page. When I click for a particular story, Firefox often loads the page but immediately erases it and says, "Application error: client-side exception. See console for further information." It does not happen every time, and I have not encountered it with any other website.

I use the latest Windows 10 and fully updated Firefox.

There seems to be a link missing when viewing LinkedIn profiles using Firefox. In MS Edge, I have the option to click on 'see more' to view the full 'About' section, whereas this is not showing in Firefox (attached screen-shots refer). I've contacted LinkedIn, who say that it's not their issue! I certainly used to be able to expand this section in Firefox; not sure why that functionality is no longer there. Any suggestions? Many thanks for your help.

Working with two monitors, the In-box on Thunderbird + the mail provider Webmail Alaska-communications on the second monitor The incoming mail on Firefox ought to show up as well on Thunderbird Inbox, usually that works, not anymore, for some reason - what I did to create this issue I do not know Thanks

For a while now (over a year), after using Firefox for YEARS, I am having LOTS of trouble logging into my Online Citibank. I am using 64bit version of Firefox. I go to citi.com and put my Id and Pw in, then signin. I see the page loading, with Citi webpage boxes showing Just as Shadow/Boxes for a moment or two, then I get a You Successfully Logged out!! Try again. Same. I believe that I have Sometimes gotten something about Logged Off for Inactivity. If I am able to QUICKLY Click on one of the Shadowed Boxes, I get ON my Citi webpage and am able to do my banking, without further problems. I have Cleared my Cache and Other suggested (from reading problems from other users) fixes, but NOT fixes. I do NOT have this problem on ANY OTHER websites! So, some conflict with Firefox and Citibank. I WAS able to login, with NO problems with Microsoft Edge. Didn't try Chrome.

I have been using Firefox for years..and Quickbooks on line(intuit). Overnight I can no longer access my account. I can log in but but now Firefox is stuck in the loading screen. I do have access on Chrome. Any ideas? (the green dots are the loading animation..they just keep spinning.) mm

Since about October 2024 suddenly in Firefox all checklists of synchronized iCould Notes appear with the checkpoints shown just as black boxes and cannot be used anymore with a checkmark Y/N as before. Pls see the picture attached.That is not the case on Microsft Edge. What can I do?