Firefox Community Forum

web.de verweigert den Zugriff auf Mailkonten, da eoin Werbeblocker installiert wäre. Ich habe alle Erweiterungen abgeschaltet, aber trotzdem erhalte ich keinen Zugriff. Was kann ich tun?

My Win 11 (25H2) desktop occasionally sends me to renew access on my gmail account (via IEEE organization, services10.ieee.org) where I enter my walter.dinkins@ieee.org email and then it sends acknowledgement to Google or YouTube on my iPhone. Now I keep getting error message "Unable to connect". I am able to connect on my iPhone via the Firefox app but not on my PC. I added https://mail.google.com and hppts://accounts.google.com but still not luck. Any other suggestions? Regards, Walter

Hi

I need to block some sites through the OS Hosts file, Other browsers ( Edge, Chrome, .. ) are honoring the HOSTS file rules but Firefox bypassing them !! , I disabled the DNSOverHTTPS and all other available suggestion and options but still not honoring the hosts file !

as you can see in the attached file, the Firefox DNS Section is now blank ! but still doesn't follow the OS host file

I even made a custom policy file but still doesn't work, these are the things I disabled but still not working :

{

 "policies": {
   "DNSOverHTTPS": {
     "Enabled": false,
     "Locked": true
   },
   "Preferences": {
     "network.trr.mode": {
       "Value": 5,
       "Status": "locked"
     },
     "network.dns.native_https_query": {
       "Value": false,
       "Status": "locked"
     },
     "network.trr.uri": {
       "Value": "",
       "Status": "locked"
     },
     "network.trr.bootstrapAddress": {
       "Value": "",
       "Status": "locked"
     },
     "network.trr.exclude-etc-hosts": {
       "Value": true,
       "Status": "locked"
     },
     "network.dnsCacheEntries": {
       "Value": 0,
       "Status": "locked"
     },
     "network.dns.disableIPv6": {
       "Value": true,
       "Status": "locked"
     },
     "browser.fixup.dns_first_for_single_words": {
       "Value": true,
       "Status": "locked"
     },
     "keyword.enabled": {
       "Value": false,
       "Status": "locked"
     }
   }
 }

}

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 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

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.

Hi, I'm a developer and I was having some issues with my service worker so I unregistered it from firefox (probably should've double checked what that did, oops) but now I can't get it to reregister again. The service worker will show up when I load the site from private browsing but that's because the origin will show private browsing. Have I just blocked my url from registering a service worker? How can I undo that?

Hi, I am trying to login to a retirement account that Firefox/Mozilla is blocking. The site works on another browser, but, since I like to use Firefox exclusively for online work, I would really like to access the login there. Any suggestions? work arounds? I get an access denied ERROR 15 "This request was blocked by our security service" instead of the login. Since this site is a retirement account site, I cannot give more info.

Delete or block a website. https://thelatestnewsforpatriots.com/dananative/?cep=bOd6PrRvOWRKzKbbBJOxzG1b0QmJ6mCPBMHy_GIZ-FxI6NLIlz7ioftBfMry7snMtsIoKeO3wAhv3FwAHidZhhNWYPqafw_-5rLFOZ1lusaHcBLY_ay2dpnK3DrGfFdDocyREGZ7qsMH9d8tojcqfQAyboLHlDKVunuvFqqwVe16fMhwN04BxnHZ-NBQtI_UIvpVzFpsAhROfssVKfpqVl2C2LbXIFjitgJMv7Gbu2gK7utu3T8vgBq5eBs6N6stXoGTuiYtdixld2X513I7P-CjDlFxu6hQElDByjArn34R--7kH1Z5oNj5ViwidbCxNtKczYUXgYRRQSzmh_p7RIk-_dnqSs555sO98AWR_RpKJGfrvox7pihoGWilzK8v5nmEZGyp5yDHk6muFCcsjrME864UCOdzYJgwqjCzFyGbrnm2CQrioZt86CdzzCOaIAjle0aL_Njc9S771qAsiCXqBqLECPwvwQ6J5_5QobIx9y9GK88ESy8BLCVUlkl5zKdP7db7MPHR1WJzedEx4VaZwYD2t_5oqrNIhdBvJafhaK4o7N0TZuDjztbvM3wNvnRVO95L7ld3nUW80my_1t5v6hbus_XpnpN3rt8aqGJXz8y1BguE0t97o3A8MEqnm4me0PwgOPvx-ksTytUpKw&lptoken=17854280759215c721a0&operatingsystem=Windows&placementID=122812&siteID=24137&domainid=1205202&channel=News&subchannel=Conservative+News&mediaID=139796&keywords=&city=Tyler&browser=Firefox&cpv=0.0187625&s2sParam=8db60b26-95a2-4d91-aec5-468abb2aee76

Is some setting in my Mozilla now preventing this site from loading?

http://loc.gov/collections/dun-and-bradstreet-reference-book/?st=gallery

'bold text My updated version of firefox does not have my bookmarks, will not print all pages, will not allow to select print in color, will not display images in downloads only text.

Why do I keep getting blocked from sites like Newmax? I have to use Opera to connect with it and a few other news sites as well. I can't even be on the site and go to a story then get blocked. I currently have started using Opera now but had so many years with Firefox guess it is over with. Are you working with Democrats to block conservative news site? Certainly feels like it and done with the hassle so glad for Opera!