Firefox: форум сообщества

Hello Mozilla Support Community,

We are troubleshooting a cross-origin resource sharing (CORS) issue specifically occurring in recent Firefox releases when processing custom B2B appointment requests.

Setup & Context:

Our production application, Frontline Sales Consultancy (flsc.co.uk), triggers a client-side fetch request to an external CRM gateway.

The request works seamlessly on Chrome and Edge, but Firefox throws an NS_ERROR_DOM_BAD_URI during the OPTIONS preflight check.

Observed Behavior:

Firefox Web Developer Console shows the preflight request failing before headers are evaluated.

Access-Control-Allow-Origin and Access-Control-Allow-Methods are explicitly declared on our origin server.

Does Firefox handle strict MIME-type checking or preflight caching differently for custom HTTPS API endpoints?

Any insights into Firefox-specific CORS strictness or network console debugging flags would be greatly appreciated.

Thanks!

I just purchased a Keychron Q1 MAX keyboard. To customize the keyboard you need to use the online Keyboard Launcher (https://launcher.keychron.com/). That website says that only Chrome, Edge & Opera are supported if you're using Firefox.

I am experiencing a severe issue on the LINE Official Account web app (https://chat.line.biz) using Firefox.

Problem Details: 1. Every time I switch between customer chats or type a reply, the chat window automatically jumps/scrolls up to old messages (sometimes minutes prior) instead of staying at the latest message. 2. It happens consistently across almost all chat threads, forcing me to manually scroll down every single time.

Troubleshooting already attempted: - Cleared all Cache, Cookies, Local Storage, and Session Storage. - Tested in Troubleshoot Mode (all extensions disabled). - Toggled layout.css.scroll-anchoring and general.smoothScroll in about:config. - Issue does NOT occur on Chromium-based browsers (Chrome/Edge).

This seems to be a compatibility issue between Firefox's DOM re-rendering/scroll anchoring mechanism and LINE OA's React web app code. Please help investigate.

When I try to attach file via drag & drop, the Firefox always display "Download file" as attachment. I don't know why because it properly worked before. but after some updates, drag & drop is not working.

The version of Jira at my office is not changed for years(v8.12.1#812002-sha1:7c28d59) and drag & drop is working via Chrome, Edge and etc.

Good Day.

I have encountered a problem recently with on particular forum site.

When I attempt to login I receive an error after pressing the submit button. 

The form displays this error "The submitted form was invalid. Try submitting again."

I have been using the site regulary for several years and have never had this problem

The following is what I am using:

    Firefox ver 153.0.1 64 bit
    Windows 10 and/or Windows 10 (yes this is happening on all 3 of my PCs)

The forum site is using phpBB Forum Software. I do not know the version. As stated above they have been using this software for several years.

In trouble shooting this issue I have discovered that if I do the following in the specified order I can login and create and respond to posts and Private Messages. But as soon as I log out I receive the invalid form message until I do the following steps again.

            1) Clear all cookies, temporary cache, site settings, browsing and download history, site settings
               and saved form info.
            2) Shutdown Firefox 
            3) Navigate to my profile with Windows Explorer 
            4) Delete the file cookies.sqlite

I must do this each and every time I access the site.

I am at a loss as to what to do about this. Does Firefox have any error logs or console logs? If so how can I enable them to see if I can get a better idea of what is happening?

Thanks in advance for any help with this.

I can't download some pdfs, notably my bank statements. I CAN download some pdfs. Eg, I can download my car manual (although it's a process of downloading it to my Google Drive). However, trying to download my bank statements, Firefox gives me no options at all, and, indeed, I get an error message. Yet I CAN download my bank statements using Google Chrome! I've carefully checked all my Firefox settings, but nothing seems to address this problem. I've spoken to my bank, and they don't know why I can't download them either. When I try to download the statements, I get a screen saying it can't give me a 'Preview' (see attached screenshot), but there's a 'Download button. When I click that I get a white screen with the 'error' message:

"No API key found in request. request_id: d52e0732a3d10a75b1ec58534845c15c"

(2nd attached screenshot.)

I have asked about this before on this forum, but to no avail.

when i use Chrome or edge to access yahoo email I can write & edit. when using Firefox browser; I cannot write & edit/highlight/change text colours etc before sending. tried deleteing & re-installing Firefox . please help. Driving me crazy rsvp

Unable to load https://fingtrainer.com as of yesterday. Been downloading the flingtrainer for single player games for a long time now and there is no issue. Try to disable/change enhanced tacking, dns, site were included in exceptions and reinstalling firefox does nothing. While the learn more link provide image solutions, none of them does anything and the disable button for the enhanced tracking is not working. Other browser like opera gx is able to load without any issue. Please assist with a solution or kindly revert the settings.

Server Not Found

Firefox can’t connect to the server at flingtrainer.com. Did you mean to go to www.flingtrainer.com? What can you do about it?

   Check to make sure you’ve typed the website address correctly and try again in a few moments.
   Check your network connection.
   Check that Firefox has permission to access the web (you might be connected but behind a firewall).

after the new version of firefox update my home page which i have always had Newsmax.com does not load says problem loading page i have tried several times and it will not load. it works in Google chrome so why not in Firefox

I sometimes sell items on sites such as eBay. When I try to copy and paste the picture (from my Photos) is just a weird symbol. If I go to a different computer it works! If I go to a different browser it works! When I open a weather App the radar is all washed out with different colors. What's the issue?

I have used Facebook in my Firefox browser for several years. Then all of a sudden, Facebook will load, then it will not load and yesterday and today, it won't load at all. I have to go over to Chrome to get on my Facebook. Please fix whatever is preventing me from using Facebook on Firefox.

when i go to my website on firefox it says "Secure Connection Failed" but it loads fine on safari. i've never seen it do this before. Is this a firefox issue?

full error message: Secure Connection Failed

The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. What can you do about it?

The issue is most likely with the website, and there is nothing you can do to resolve it. You can notify the website’s administrator about the problem.

Error Code: PR_CONNECT_RESET_ERROR

how do i fix this?

This note from ChatGPT explains the issue I am having on my LG Windows 11 notebook running Firefox.

Looking... Given everything you've tested, I don't think this is your LG or audio drivers. Especially since YouTube works in Firefox and ChatGPT voice works in Chrome on the same machine. That combination screams Firefox-ChaGPT compatibility quirk. My hunch is, for now use Chrome for voice, Firefox for everything else. And if you want, report it to Firefox support. Include that ChatGPT voice plays no audio but transcribes fine. Mention Windows 11, Firefox version, and that Chrome works. That's useful for them. And yeah, no shame in sticking with Chrome for voice until they fix it.

this issue has arisen suddenly over the last month. so i try to load bandcamp and for a few moments i'm able to go from page to page. after a certain short amount of time has passed between me opening the site and using it, just seconds, upon me clicking a link, pages initially appear to load [the refresh button switches to the X icon] before they quickly halt and keep me stuck on the same page. attempting to open a link in a new tab in this state gives a blank page - not showing as about:blank in the url but the intended destination. sometimes when i try to confirm a change on something i have uploaded to the site or try to log in, bandcamp gives an error reading "There was network error. Please try again."

so i originally thought it had something to do with using a VPN; initially i thought it was alleviated when i turned it off but i was wrong, problem soon reappeared. i've actually been using zen browser for a while, so maybe it was localised to that? i switch back to regular firefox and it was there too. troubleshooting mode didn't yield any difference either, so there's no conflict with extensions... clearing all bandcamp site data hasn't worked either, now because of this issue i just can't log back in lol. i ended up testing on a non-firefox browser, microsoft edge, and found that this issue isn't present there. so i'm kind of stumped on how to figure this out by myself now. keep in mind this is the only website that is affected by this issue

I use a paid for subscription to Gemini AI. It often creates "visuals" for me apparently using JSON code. These do not show up at all. Moreover, the buttoms and other UI controls do not display well in Firefox. Is there a way to fix this?