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Hi Community,

I’ve used Firefox for over 20 years and it’s always been my main browser, but since updating my Mac to macOS 27, Firefox has become unusable with one of my essential web apps (FlightLogger). The first page after logging in loads normally, but any click or navigation after that fails. The header stays visible, the rest of the page stays blank, and clicking links only adds a “#” to the URL with no content loading.

Safari works perfectly on the same machine and same network.

In Firefox’s console, every JavaScript file coming from CloudFront fails with “CORS request did not succeed (Status code: null)”, and I also see repeated “A ServiceWorker intercepted the request and encountered an unexpected error” messages. Module scripts are also blocked with “Module source URI is not allowed in this document.”

To rule out local issues, I’ve already reinstalled Firefox, created new profiles, cleared all caches/cookies/service workers, disabled all extensions, disabled DNS‑over‑HTTPS, disabled Enhanced Tracking Protection, reset macOS network settings, checked proxy settings, and tried different networks. The problem persists even with a completely fresh Firefox install and profile.

This started immediately after upgrading to macOS 27, and only affects Firefox. Safari loads the same CloudFront assets without any issue. It looks like Firefox can load the initial HTML but cannot fetch any CloudFront‑hosted JavaScript modules, which breaks navigation entirely.

Has anyone else seen this after updating to macOS 27, or found a workaround? I’d really like to keep using Firefox as my main browser.

Thanks in advance

Firefox 156.0, Windows 11.

On dzen.ru/news mouse wheel scrolling jumps back up. On ozon.ru left-click on account menu items does nothing (middle-click and right-click → open in new tab work fine). Worked normally ~1 month ago. Clean profile doesn't help. Hardware acceleration is enabled (WebRender Layer Compositor).

I'm finding more and more sites no longer work using Firefox. I've confirmed all software is up to date, and tried different settings such as turning off ad , tracker and fingerprinting protections, but nothing works. Even sites at which I have an account have stopped working. Sometimes I can still log in to the account, on others I can't even do that. If I can log in, using the account for what it's intended such as searching for and saving lists of things or following links to saved items doesn't work. I value Firefox for it's security and privacy features, and being able to sync saved information in the account and across devices, but if a site won't all that benefit disappears.

Hi everyone,

I'm facing an issue with website screen responsiveness in Mozilla Firefox. A site that is supposed to be fully responsive and mobile-friendly displays properly on my 24" desktop monitor (photos, alignment, and overall design look fine). However, when opening the exact same URL in Firefox on a 13" laptop screen or a mobile device, the visual design breaks—layouts overlap and images get distorted.

Has anyone encountered this issue in Firefox with certain display scales or viewport media queries? Is there a known fix or setting in Firefox (or layout tweak) to resolve this layout breakdown on smaller screens? Any advice or troubleshooting steps would be greatly appreciated!

The issue with https://rutube.ru/ I contacted the website’s support team, and they said that by default, videos open without sound, but after enabling it, the sound should be available for all videos and after refreshing the page. However, the sound disappears after refreshing the page and switching to other videos. I’m using the latest version of the browser; I tried disabling all extensions and clearing the cookies on the site, and this issue doesn’t occur in other browsers.

I regularly login, via Firefox, to access NAB (National Australia Bank) accounts, through their Internet Banking selection. Over the last week/10 days this login has not worked - I get a (NAB bank) message saying "Something went wrong / try again later". Trying again later does not work. (pic.1)

I rang the bank and spent some time trying to sort out the issue. Suggestion to get a new browser page via [Ctl][Shift][P] helped part way. I did get SOME of the new "logged-in page" showing, but not all the account details - blank grey lines were fading in & out like it was waiting to load information. (pic.2)

The bank suggested trying another browser, so I tried using MS Edge and was Successful. The bank has recently updated the "look" of the screen (home page) that appears once logged in. Could there be an issue between Firefox and these new pages ?

I would prefer to be able to keep using Firefox and not Edge.

Thankyou

I am a student at WGU and have been using edge for browsing. I am having trouble logging in to my coursework, everyday. I hope this browser is the solution. please help me.

I have always used Firefox to access my account with Spectrum.net, until the past few days, when my login has been rejected, repeatedly. Talking to a Spectrum tech rep, she told me to try to log in using Chrome. I tried it, and had no trouble changing my password and then logging in to my account. The tech rep concluded that the problem therefore lies with Firefox. Does Firefox need to be re-set somehow? Thanks! Hollis Barber

There is a problem, while watching YouTube over Firefox in browser incoming clock alarm stoping video but gives no sound and a brief wibration at start then totally silence and no wibration(mobile/desktop even with all add ons disable). This issue does not occurred in another application like AIMP or MX Player. Have checked additional thing like another wideo site(xvideos) and there everything works as it should. So it is seems to be problem with YouTube Phone is S23U.

We use the Deepl site for translations and it won't load in Firefox without asking the "verify you are human" questions every single time. The Deeple site does not require this authentication in Chrome but we hate Chrome and want to stick with Firefox. We just have the standard security settings in Firefox, only use Windows Firewall and our Express VPN is not switched on; our IP location is showing correctly. Firefox is up to date.

This message comes form AAA.Visa Credit Card log in

"Internal Error We are experiencing Technical difficulties. If the problem persists, please contact our Technical Support at 1-877-334-0460 for assistance.

09/10/2026, 12:03:48"

I called the listed number and they say since I can use a different browser and access the account its not their problem. We verified the log in and its correct. My security system folks state no problem with the computer and I ran a full scan with no problem. I don't know how to overcome this unless I start using something other than Firefox. Please help David

I can place bets @ Bovada website when usingGoogle Chrome' but not when using Firefox. This is a recent development as far as I can tell. I previously had no issues placing bets while using Firefox @ Bovada. Frustrating.because I do not like using Chrome.

I've always used Firefox as my default browser, it's been updated and is the current version. Recently I have noticed that pages are slow loading and some images on the page never load properly and remain blank. More vexing, is that Gmail has become very unstable in Firefox and won't load properly, loads slowly and freezes blanks out when I try to delete trash or spam, etc. It's annoying as more and more I have to open up Edge Browser to get performance on the websites that are failing in Firefox. This includes various websites that I use for work where logins are glitchy and unstable in Firefox, but work in Edge? Disappointing as I prefer to use Firefox, but even with recent upgrades installed it seems to work less well than in the past.

I am a loyal firefox user and have used it for years. Security and features are great. I use Google docs constantly throughout the workday on my Mac and I am constantly having problems with Firefox. Google docs that I work in are constantly re-loading, incompletely downloading, going offline. I typically have 5-10 docs across the platform open at a time, and the problems are preventing me from working effectively. I have tried searching help forums and done the fixes suggested (repeatedly clearing cookies and cache, turning off protections, etc). Nothing works. Any ideas before I switch the Chrome (yuck)?