Firefox Community Forum

Hi everyone,

I've got a real curious problem. I'm a student at Berkeley City College. Firefox is my preferred browser. Sometime this semester, I stopped being able to access Google.com or any google subdomain sites like Google Calendar while using Firefox Desktop at school. Here's where it gets really weird. This only happens when I using firefox windows desktop while also being on the school network. If I switch to my phone tether network then I can access Google just fine. If I launch a different browser (that is not Firefox based) like Chrome, it works just fine. I tried accessing google using Waterfox on the campus network and encountered the same problem. I consider myself to be somewhat technically proficient but this is confounding me. How could the sites at a specific domain be blocked only while using a specific browser on a specific network???

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.

Firefox is preventing me from going to certain websites because it is telling me I am using adblocker but I have none installed.. I am trying to play around with the settings but I still can't do it. Is there an inbuilt adblocker? I need help please...

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

I am experiencing an issue where Google.com (other google domains work fine) will not load in Firefox, resulting in an infinite loading loop. Other browsers on the same system (Brave) work fine.

Here are the steps I have already tried:

Reinstalled Firefox completely

Removed Firefox via sudo apt remove --purge firefox -y

Cleared all user profiles and caches: ~/.mozilla/firefox, ~/.cache/mozilla, ~/.config/Mozilla

Reinstalled via Flatpak

Tested network connectivity outside Firefox

curl google.com works correctly

DNS resolution works via getent hosts google.com in the host system

Checked proxy settings

Ensured “No proxy” is selected in Firefox → did not resolve the issue

Tested in Safe Mode (disabling extensions)

Problem persists, so not caused by extensions

Tried disabling IPv6 inside Firefox

network.dns.disableIPv6 set to true → no effect

Cleared DNS cache inside Firefox

about:networking#dns → clicked “Clear DNS Cache” → no effect

Disabled DNS-over-HTTPS (Secure DNS)

about:preferences#privacy → “Use secure DNS” → disabled → no effect

Disabled HTTP/3 (QUIC)

network.http.http3.enabled set to false → no effect

Verified Flatpak network permissions

flatpak info --show-permissions org.mozilla.firefox shows network access allowed

Inside the Flatpak shell:

flatpak run --command=sh org.mozilla.firefox getent hosts google.com

→ returns only IPv6 address: 2800:3f0:4001:839::200e google.com

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.

I'm building a website from scratch and its going great. I just tried to implement a CSP and it worked except for one small section of my website that allows a user to upload an image and that image is supposed to be displayed back to the user. Anyways long story short the CSP blocked me so I tried to whitelist data: and it still didn't work. defeated I removed the CSP from Nginx to work on it later but when I went to try and test again I get this error. ``` Content-Security-Policy: The page’s settings blocked the loading of a resource (img-src) at data:image/webp;base64,UklGRqbeAABXRUJQV… because it violates the following directive: “default-src 'self'” ``` I have confirmed with Curl and by inspecting the network tab that there is no CSP included in the headers anymore. I have restarted Firefox, created a new Firefox profile, and cleared my cache to the end of time and yet still the error persists. I don't know where or how Firefox is storing website headers but they persists and also apparently work between profiles an implication I'm not going to delve into here. If someone could point me to the file where the headers are stored so I can delete it that would be wonderful.

specs Qubes OS 4.2 Mozilla Firefox 140.4.0esr

Hi. I am trying to get into chase.com web without success. Why I already try several download with different browsers.

Good morning. Would you please help me with this: I need the site: https://www.tempo.pt/lisboa.htm not be blocked. I have tried everything recommended with no success. It is a site about the weather that I visit every days to know the state of the weather in the City I live in. I appreciate your kindly help. Thank you.

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"
     }
   }
 }

}