I-Firefox Community Forum

I am trying to use a link provided by my apartment property manager. It is https://hermitagehills.loftliving.com/login When I use the link, or even type the website, on my desktop computer, using Windows 11, I cannot access the website. However, if I use any other device the website address works fine. I looked to see if I have the website blocked, but cannot find where to do that in Firefox. I know I have not blocked this website address. Can you help give me some suggestions? Thank you.

Bonjour, Depuis deux jours, je ne peux plus me connecter à ma banque, alors que tout fonctionnait très bien auparavant. Pouvez-vous m'en expliquer la raison et me dire ce que je dois faire. Cordialement

Mozilla Corporation is sending me a box message from Nsv353A.tmp published by Mozilla Corporation teeling me to sign in to Amazon What is this?

And how do I fix this?

Hello,

I have a problem with YouTube videos not playing on any website when using Mozilla Firefox. Whenever a site (like zamunda.net or other forums) embeds a YouTube video, I get the following message:

“Error 153 – video player configuration error” or sometimes “For your protection, this page will not allow Firefox to display the embedded content. To view this page, you must open it in a new window.”

If I open the same video directly on YouTube (youtube.com), it plays fine. This issue happens on all websites that have embedded YouTube videos, not just one.

Windows 11 25H2

Firefox Last Version

Could this be related to codec support (H.264 / MSE) or a security restriction with embedded frames? Any suggestions on how to fix or debug this would be appreciated.

Thank you, Panche

Graphs generated by Google Gemini Pro 2.5 do not display in Firefox. They are generated and then quickly removed from the display by something in Firefox. I am not running any adblocker software or extensions other than anything that is native to Firefox. I have tried changing about everything possible in the privacy settings and have not been able to fix it.

Here is what Gemini says it does when it generates a graph versus a AI generated picture.

Data Visualization (The "Graph") 📊

When you ask me to "graph," "plot," or "chart" data (like a drag polar), I use a Code Interpreter.

My Process: I write and execute Python code using a data visualization library (Matplotlib). This code performs calculations and generates a brand-new chart from scratch.

Why It Fails to Display: The resulting image is a piece of procedurally generated content. The way it's embedded in the page is more complex than a standard image. Aggressive ad blockers or strict browser privacy settings often mistake this type of dynamic content for a pop-up, an ad, or a tracker, and they actively block it from appearing—which is what causes the "appears and then disappears" issue you described.

Any help you can provide would be greatly appreciated. Thanks.

I have pop up blockers set to allow pop up blockers, but ev en though they are turned on. Firefox will not allow pop up windows in the learning management software (D2L brightspace) used at my university.

Hello. I did not receive an answer to my last help request. A Block Ad does not allow me to access this site: https://www.tempo.pt/lisboa.htm?utm_source=newsletter&utm_medium=email#-0eebc5457c97ef8bca0b518ed4194951 I need some help, please. Thank you.

Hello Mozilla community

I’m troubleshooting a Kerberos/SPNEGO proxy auth issue and need help understanding whether this is a Firefox bug or a misconfiguration on our side.

Environment :

Client OS: Ubuntu 24.04 (GNOME session)

Firefox: 144.0

Other clients on same host: curl (works) and Chrome/Chromium (works)

Proxy (on-prem): swg.test.local:8080 (HTTP proxy performing Negotiate/Kerberos authentication)

AD / Kerberos realm: TEST.LOCAL (users), service SPN: HTTP/swg.test.local registered in AD

Domain trust: one-way trust exists between test.local and test.intra (contextual; but current test is within test.local)

Symptom :

curl --proxy http://swg.test.local:8080 --proxy-negotiate -u : http://example.com -> negotiates and sends Proxy-Authorization: Negotiate ... and request succeeds.

Chrome also performs Negotiate and the request succeeds.

Firefox never sends Proxy-Authorization: Negotiate and the proxy returns 407 Proxy Authentication Required. No prompt for credentials; negotiation does not start.

What I already validated

Kerberos TGT is present in user cache:

kinit user@test.local klist

TGT is visible and valid.

curl and Chrome negotiate successfully from the same host (so SPN, AD, keytab, realm mapping are working in general).

Firefox launched from terminal (so it inherits KRB5CCNAME) still does not negotiate.

I enabled KRB5_TRACE and launched Firefox; trace file stays empty (suggesting Firefox did not call into GSSAPI for this request).

Network capture shows proxy challenge Proxy-Authenticate: Negotiate and no corresponding Proxy-Authorization header from Firefox.

Firefox prefs checked / set (About:config values I validated/changed)

network.negotiate-auth.trusted-uris = swg.test.local,.test.local → Ensures Firefox will send Kerberos tokens to that host/domain.

network.negotiate-auth.delegation-uris = .test.local (optional)

network.auth.use-sspi = false (Linux)

network.negotiate-auth.allow-non-fqdn = false

network.automatic-ntlm-auth.trusted-uris left blank or set to .test.local

Despite network.negotiate-auth.trusted-uris containing the exact FQDN and domain, Firefox still does not attempt negotiation.

Diagnostics already captured

tcpdump pcap covering UDP/TCP 88 and proxy port 8080 (shows proxy 407 and absence of Proxy-Authorization from Firefox)

KRB5_TRACE=/tmp/krb5_trace.log for Firefox launch (no GSS calls logged)

Reproduced curl/Chrome flows that do include Proxy-Authorization: Negotiate ...

Hypothesis

Firefox is refusing to attempt Negotiate at all — likely due to either:

a preference that’s still missing or misinterpreted (trusted-uris format, wildcard/domain handling), or

a desktop-launch / environment isolation problem (GUI-launched Firefox not seeing Kerberos credentials or environment), or

a bug/regression in Firefox’s GSSAPI/SPNEGO integration on Linux (e.g., refusing to use a credentials cache inherited from the shell, or ignoring network.negotiate-auth.trusted-uris for proxy authorization specifically).

What I need from the community

Has anyone seen Firefox on Linux behave this way (curl/Chrome work, Firefox never starts Negotiate) with an on-prem proxy using Proxy-Authenticate: Negotiate?

Any additional about:config prefs or hidden flags that affect proxy SPNEGO (not site SPNEGO) that I should check? I already set network.negotiate-auth.trusted-uris.

Any differences in behavior between Firefox launched from GUI vs. launched from terminal that might cause the client not to use the Kerberos ticket cache — and reliable steps to reproduce/diagnose?

If you have a small reproducible test case or a recommended debug build/flags to capture verbose Firefox GSSAPI logs (beyond KRB5_TRACE) please share them.

If this is a known bug/regression, pointer to the bugtracker entry would be appreciated.

Thanks in advance

Error code 403

Error ID IjcpdgAAAAAAAAAAMfV4Nb~F

My IP is 49.245.120.53

I was trying to reach this page (a government service page), https://eservices.ica.gov.sg/ipapples/index.xhtml ,

I got this response: "Although the request was valid, the page/resource you are trying to reach is absolutely forbidden for some reason."

then I got this: "The web server thinks that the HTTP data stream sent by the web browser was correct, but access to the resource identified by the URL is forbidden for some reason. This is highly likely due to the reason that your recent action or browser behavior has been flagged as suspicious, either you have failed all authentication tests, including CAPTCHA, or performed an action on a protected application deemed illegal or malicious by the Web Application Firewall (WAF). Access to the requested page/resource is therefore blocked. If the source IP is on the blacklist, you will keep seeing this page until being removed from the blacklist. "

then it advised: "Clear your browser’s cache and try again. If you believe this to be erroneous, please contact the site owner citing the Event ID indicated above and provide a description of what you were doing before you were denied access."

Now, acting upon that advice, I've cleared my Firefox browser cache, but problem remains.

So, may I request that Mozilla remove (or a kind person help me to remove) my IP from blacklist? Thank you.

I keep trying to enter a shopping website I have used before in the past and keep getting the following: We block the use of VPNs and proxies to combat fraud We want you to have the best experience shopping with us! To continue, please disable your VPN or proxy.

Thank you for your patience! Your business is very important to us!

I can not open : www.mobile.de What is here going wrong ??

Access denied  ?? I cannot understand this ?? Thanks for help, rainer banspach

I am unable to open links to various sites, like OnShape, Banqiue of Montreal, Banque Laurentien and more... Any security that bvlocking access??? I am running Fox from Linux over Window 10. Says You have not granted any special permission to this site.../.

Help - any hint?

Martin

There are many sites that refue to load correctly. Soundcloud does not load at all and assets from Canva's stock media library only load the alt text descriptions. Both show that the culprit is the cross origin requests being blocked. I have reset Firefox to factory settings, uninstalled plugins, disabled enhanced tracking prevention, etc and tested private browsing which sometimes works but seems to be inconsistent. Any guess on why Firefox would be blocking Cross-Origin Requests? These sites have worked with Firefox in the past and work on Safari on the same Mac.

Canva: Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://media-public.canva.com/KH7y4/MAEGv3KH7y4/1/tl.png. (Reason: CORS request did not succeed). Status code: (null)

Soundcloud: Failed to load ‘https://a-v2.sndcdn.com/assets/2-517dcb44.js’. A ServiceWorker passed a promise to FetchEvent.respondWith() that resolved with non-Response value ‘undefined’. service-worker.js:1:2774

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://a-v2.sndcdn.com/assets/2-517dcb44.js. (Reason: CORS request did not succeed). Status code: (null).

<script> source URI is not allowed in this document: “https://a-v2.sndcdn.com/assets/2-517dcb44.js”.

Using FF 143.0 on Win10 64 bit. I do not use any password manager. Before I logon to any site, as a matter of course, I clear all cookies and history. I logon just fine to many sites.

However, only at: amazon.com do I see this pop-up. There appears to be no way to actually verify it is really me. And there is no difference in action between "Cancel" or "X' closure.

Lastly, this pop is modal. It can not be bypassed. I have to kill it to continue to amazon.

amazon is the only place this appears, and I really don't know what is generating it.

Any clues anyone.

BartelsJuice