Firefox Community Forum

Please help, a very tricky problem: Work Scenario: I need to use the company-provided VPN software to access the internal network. Its principle involves redirecting requests to a virtual network interface before sending them out. On Ubuntu 24.04, both Firefox 140 and older versions can access both internal and external networks normally.

Issue After Upgrading Firefox: After upgrading to Firefox 141, all connections (internal and external) fail when the VPN is active.

Key Symptom Observed: In the Firefox networking debug page (about:networking#dns), the DNS suffix should display as localdomain, but after upgrading to Firefox 141, it appears empty.

This has been a problem for me for a very long time, and I'm tired of having to use Chrome every time there's an update to Firefox.

The issue I have is that I will get the notification saying there's an update. I click the button to update now, the browser opens the auto download page and I get a not secure connection warning. The only work around I've found is to use Chrome, and sometimes I can use the "Other downloads" option.

I'm not running a VPN, or any other networking software on my pc. This is for the full program, not the Windows Store app.

Secure Connection Failed

An error occurred during a connection to download.mozilla.org. The server uses key pinning (HPKP) but no trusted certificate chain could be constructed that matches the pinset. Key pinning violations cannot be overridden.

Error code: MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

i have problem with setting up my proxy. i choose manual proxy configuration, fill the HTTP Proxy & port. When i click ok then input username & password but it keep asking for the username & password. (I have asked the proxy provider they say the proxy is good, no problem)

I get the USPS informed delivery emails that show what mail is arriving daily. Whenever I click the "dashboard" link, I get:

Bad Request

Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit. If I go to the site, and click a link, the same thing happens. This doesn't happen with Chrome where links function normally. So, I think there must be a setting somewhere preventing me from accessing the links. I tried turning off "Block pop-up windows," but that had no effect.

Thanks, Ed

why does firefox blocks incoming http conection to localhost:8080 when I try to obtain a google oauth2 token using oauth2.py ?. The Google server returns the token via http to loaclhost:8080 and the port is blocked by firefox.

FF now won't access facebook or amazon websites. FF worked yesterday but wouldn't access either site today. Both Google and MS Edge access both sites. I have cleared cash and reinstalled FF with no luck. Help Please

For two days I have been unable to access the internet using my default Mozilla Firefox browser. I have used Mozilla as my default browser for many years with no problems, but have had to use alternative browsers not only to access my emails on Outlook, as well as other nominal sites, but even to sign into my Mozilla account, I had to use Microsoft Edge browser. I have made no changes to my settings or internet security. Please advise. Thankyou

I have Express VPN and use Firefox as my default browser. This morning I cancelled the autorenewal of Macafe and uninstalled it from my HP Laptop. Now I cannot access the internet if the VPN is activated - using Firefox or Edge. Thank you

Attempted to do an Firefox update more than a month ago on my HP (microsoft windows) computer. Everytime I open my computer I gt the Firefox Crash Reporter Window. When I hit the Quit firefox box it submits the crash report and then I X out the box. I cannot use Firefox as a browser. The DISASTER is that I CANNOT open any files previously downloaded while using Firefox (eg PDF files). I get the crash report box. I NEED these files!

Please HELP!

The connection was reset

The connection to the server was reset while the page was loading.

   The site could be temporarily unavailable or too busy. Try again in a few moments.
   If you are unable to load any pages, check your computer’s network connection.
   If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the web.

What can I do to resolve this problem.....Problem loading page

Hi. I have a Dell Inspiron, it’s a few years old, and my computer is running windows. Today I was on a website, doing my assignments as usual when randomly the internet stopped working on the browser (I was on the web for about an hour before this). There was no change to my behavior, I had been on the same site for the whole hour, and had been interacting with the site during that time. My computer still says it’s connected to the internet, and I was even able to play an online game on my computer that I had downloaded, so it looks like my computer is connected to the internet. I’ve tried to clear my cache and open private windows but that didn’t help.

Hmm. We’re having trouble finding that site.

We can’t connect to the server at healthy.kaiserpermanente.orghttps.

If you entered the right address, you can:

   Try again later
   Check your network connection
   Check that Firefox has permission to access the web (you might be connected but behind a firewall)

What does this mean and how do we fix it?

Firefox 147.0.4 on macOS 26.3 does not work via SOCKS proxy.

Firefox 147.0.4 on Windows 11 x64 works fine via the same intranet SOCKS proxy, with exactly the same settings.

The advantage of Firefox is its flexibility. It supports its own SOCKS proxy settings, independent of systems-wide ones. Unfortunately, it seems this Firefox feature is broken on macOS (but Windows version works perfectly).

Safari 26.3 (21623.2.7.11.6) and DuckDuckGo 1.177.0 (625) web-browsers that use system-wide macOS SOCKS proxy settings also works fine with this intranet proxy server. So it seems SOCKS proxy server itself is OK, and the problem is confined to Firefox on macOS.

Has anyone seen Firefox 147 on macOS work via SOCKS proxy? Is there a principal difference between how Firefox handles SOCKS proxy on macOS vs. Windows? What might be the best way to address the problem on macOS?

Thanks!

The following is what happens when I try to logon to AT&T Yahoo mail/Currently.com "Something's gone wrong We may be having trouble with your connection. Connecting your device to Wi-Fi could help fix the issue or try again later. If you were using an app, close this page. Otherwise, start over."