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.

On my opening Firefox page there is a header " Your browser is being managed by your organisation". I am an individual and have no organisation. I am having problems with Ancestry which they have directed back to my browser. This is this last thing (I think) that I do not understand. Any ideas most welcome please.

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?

i have used mozilla for many years, i HATE google! last night 12/31/24 duckduckgo was my search engine, i stayed up until 1 or 2am on 1/1/2025 and watched several youtube videos (i had been watching them all day) and turned my computer off and went to bed. around 9am 1/1/2025 i got up and turned on my computer, clicked mozilla in my toolbar and started a search, I GOT GOOGLE RESULTS, SO HIT THE BACK ARROW AND NOTICED GOOGLE WAS MY SEARCH ENGINE!! DID YOU DO AN UPDATE OR ANYTHING TO CHANGE MY SEARCH ENGINE TO GOOGLE? i managed to download duckduckgo and make it my search engine again. BUT i NEED to know if this happened on YOUR END, or if GOOGLE did something. I HAD NOT MADE ANY CHANGES TO MY COMPUTER ON 12/31/2024 OR THE EARLY MORNING HOURS AFTER MIDNIGHT!!!

IF MOZILLA DID THIS , I DO NOT UNDERSTAND WHY, BUT IF IT WAS NEFARIOUSLY DONE BY GOOGLE, THEN IM PISSED!!! THANK YOU!

Dear Firefox Team,

It has re-occurred to my Firefox Browser of the latest version of 115.18.0 with some websites I have recently visited however which has appeared 8 grids of blank or white pages again under "Recent Activity" as attached with the image for your technical troubleshooting suggestion.

Those 8 grids of Recent Activity in the older version of Firefox browsers used to have shown colorful graphics or images representative of the recent websites I visited in the recent past.

May I know what I am supposed to do to recover those graphics or images?

Kindly offer any suggestion or solution?

Thank you for your kind attention.

Best regards,

Mr. Topaz Chiu

No security code is being sent to my email account. rlisterman@comcast.net

So I'm unable to open VPN on my new computer.

Why isn't this working???

Until 2 or 3 months ago I was able to login to https://clearspringlife.com/login. Now I receive "403 Forbidden" error when I try to login. I can login using MS Edge. Bob Inman