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Our team has already tried to fix the issue for a week now and none of the approaches seem to fix the issue. Does the Firefox dev department have any hints or clues for us?

Short description: Firefox network.lna.blocking blocks same-origin/loopback requests when the page is controlled by a Service Worker

Symptom: Login via OIDC fails in Firefox (the backend call after the IdP redirect is blocked). The error disappears if either network.lna.blocking=false is set or the Service Worker is disabled.

Environment: - Frontend (react) and backend run on the same machine (loopback/localhost)—no cross-network scenario. - Firefox with active network.lna.blocking (experimental Local Network Access feature, Chromium’s equivalent is Private Network Access).

Root Cause (Analysis): 1. apps/react/sw.js registers a global fetch listener via Workbox and calls workbox.core.clientsClaim(). This causes every open page to be immediately controlled by the Service Worker. 2. registerServiceWorker() is called unconditionally on every app start, regardless of authentication state—even on the login/OIDC page. 3. The app uses hash-routing (URL fragments like “#/oidc”); the login page and the rest of the app share the same document URL, so you can’t restrict the SW scope to “everything except login.” 4. Once a page is Service-Worker-controlled, every fetch—including requests not explicitly handled by Workbox routes—first goes through the SW’s fetch event (default behavior when any fetch listener is registered) before proceeding to the network if it isn’t intercepted. 5. Hypothesis: Firefox’s LNA implementation doesn’t correctly inherit the address-space classification (loopback/private/public) for SW-forwarded requests across the controlling client. A direct document fetch (loopback→loopback) is allowed, but an identical target fetch routed through the SW is blocked.

Reproduction (minimal): 1. Use Firefox with network.lna.blocking=true (the default in affected versions). 2. Load a page that registers a Service Worker with a fetch-event listener (e.g. via Workbox precacheAndRoute + clientsClaim()). 3. Ensure both the page and the target resource are served from localhost/loopback. 4. From the SW-controlled page, call fetch() against the loopback target resource → the request is blocked. 5. By comparison, the same fetch from a non-SW-controlled page succeeds. 6. Setting network.lna.blocking=false also allows the fetch to succeed under SW control.

Excluded Causes: - Different address spaces for frontend/backend (both are on the same loopback machine)—ruled out. - Misclassification due to redirect_uri or cross-origin navigation—the OIDC redirect is a top-level navigation (unaffected); only the subsequent backend call (token exchange/session validation in SsoLogin.tsx → ssoLoginSubmit) fails.

Heyo! So, I've had this ongoing issue with Firefox for quite some time around trying to access the Newgrounds website, but failing to do so. I have tried several things such as disabling the enhanced tracking setting, disabling DNS over HTTPS, forcing cookies and third-party popups to be allowed but that does not work what so ever and disabling enhanced tracking is greyed out so it's not even clickable to toggle off.

One thing that did work was to use the built-in VPN, but I really don't want to constantly have to use a VPN to browse one singular site every time I want to access it. So now for the question. Has anyone else experienced this? And if you have, how did you solve it if at all?

I am trying to browse a particular website (olivegarden.com), but it automatically redirects me to the country-specific website (olivegarden.ca). I have tried it on different browsers but I get the same result. It does not do it for Amazon or other websites for example. When I use a VPN, I have no problem accessing the .com website. Do I need to adjust the settings on Firefox or is this an issue with Olive Garden? I have reached out to them but so far they are unable to help me.

Google has not worked on Firefox for me for the last 2-3 days and always gives the same error message: " The connection has timed out. The server at www.google.co.uk is taking too long to respond."

This issue only exists in Firefox, not in Opera or Edge. I have tried clearing the cache, using using Troubleshoot Mode, changing proxy settings to No Proxy, disabling antivirus, restarting the browser, and restarting my PC. None of these have made any difference, not even a slightly different error message. Google does, however, still work on my Firefox for Android.

As far as I can tell so far, Google is the only website affected by this issue, every other website works fine. Gmail and YouTube also still work fine, it's really only Google search.

Any help with this would be greatly appreciated!

Hi,

I am trying to go to a particular website and I get this error message in different browsers including Firefox and my android smart phone. What does this mean? Is there a problem with his website.

Thank you, Amy

Hello- about 6 or 7 months ago I started noticing issues where I will type in a web address or a search term and it will not do anything after pressing enter. Just sit there blank. This does not happen all the time but is happening enough that it is frustrating. for example I could type in bank of america or amazon.com or something like that and it will not do anything. No spinning wheel no anything. I can delete what I typed in and try typing something else and the same thing. I can open a new window and try searching again and it will do the same thing. Then a few minutes later I can try it again and it will work fine. BUT what DOES work always is if I open a new private window and search that way it will always work.

Any thoughts? i've deleted cache/browser history, cookies, un-installed and re-installed. I have the firefox is up to date message. I am using FIrefox 151.0.3 64 bit Using windows 11 Home version 25H2

I use Google as my default search engine in firefox.

Thanks

Ryan

Whenever I now try open firefox, i get a verification page with old looking captcha visuals that is required to open firefox. Why and how do I remove that.

About this page

Our systems have detected unusual traffic from your computer network. This page checks to see if it's really you sending the requests, and not a robot. Why did this happen?

IP address: 2a02:6ea0:c472:64f6:eee7:e1ee:f337:19e1 Time: 2026-06-09T19:17:33Z URL: https://www.google.com/search?client=firefox-b-1-d&q=three+ladies+atwork&sei=YmYoaofjH9OlptQPtMq1gA4

Ok so something has changed mi get the home page up of internet banking When I click on log in It won’t load the page And a big red cross comes Suggesting b browser issue On Firefox Basic protection is on Blocked cookies ? My bank suggested I take Firefox and safari off iPhone Andre instal which I have it makes no difference Am suspicious of my bank On the home age allot about their banking app Is it a coincidence I cannot access my acc online via the web ! ? If I disable protection there is still the same issue ! It’s driving me up the wall Tried safari and it’s just the same on there ! Help please

Firefox on iphone 13 is blocked by citadeltrf.com. I’ve searched for information on Google, Chrome and Safari for information as to how to remove citadeltrf.com without finding anything. I've switched power off on the iphone. The blockage on Firefox remains when I switch it on again. I can access everything else on the phone. From my laptop I've removed Firefox browsing data and cookies. There's nothing in Downloads. No new Apps have been installed. I've checked privacy and security setting in Google, Chrome and Firefox. I'm reluctant to go back to factory settings. Have you any suggestions or should I take my phone to Apple? Looking forward to receiving your help. Kind regards Frances

Privacy Policy from TD Bank (https://easyweb.td.com) appears at the bottom of every page change, no matter if "Accept All" has be selected. Moving from one account to another causes this pop up to appear. This does not happen with Chrome. With Chrome, one "accept all" has been chosen, the pop up no longer appears

If I turn off Enhanced Tracking Protection the problem seems to stop.

Up until today (3/26) , accessing CompuServe (AOL) mail was not an issue. Now , getting to the site is OK , but when it attempts to access the mail , I get:

Firefox Can’t Open This Page

To protect your security, compuserve.com will not allow Firefox to display the page if another site has embedded it. To see this page, you need to open it in a new window.

What changed overnight? After getting the message , if I click on Mail , it works just fine. There is also a similar message when closing the page , but not every time.

Any clues?

So i have freshly installed firefox, every time i look up something on google i don't get any AI overviews, but when i use google in a private window google's ai overview works in there. what is going on? (keep in mind i have ublock origin activated on both windows but the ai only works in private mode where im not signed in)

Firefox is my browser but unable to access email page, "Access denied. You don't have permission to access .... on this server". Internet operating ok otherwise. Also, I have an old Windows 7 laptop which works fine - emails available and open ok.