Diễn đàn hỗ trợ Firefox

For over a year, my browser occasionally loses connectivity. It may work for 3 hours or 3 days, but inevitably new tabs will stop working and then slowly the others will stop as well. When this happens, none of my other browsers are impacted. They work fine. It is only Firefox. The only solution is to close everything and lose all my work.

Once I do that and restart Firefox, I receive an error message telling me I am using an older version of Firefox that is not compatible with my profile. The only solution that brings me back to the best starting place is to re-install Firefox.

My company IT spent 3 days trying to find the problem and couldn't. I have uninstalled and reinstalled so many times. All extensions are turned off, as are the two add-ons. I have been using Firefox for over a decade and prefer it to all other browsers, but I need to find a solution or I am going to have to move on. Help!!!

I am using 140 ESR version on linux with Cloudflare's DNS over HTTPS and with DOH active for some reason resolving a domain like d3oklwo3y1bx83.cloudfront.net will resolve to local host IP 127.0.0.1.

I am using firefox about:networking#dnslookuptool to test resolution of the domain d3oklwo3y1bx83.cloudfront.net Both with DOH on and off the resolution remains local host. I tried another browser on the same workstation and I was able to receive a resolution of 13.225.193.203 13.225.193.133 13.225.193.64 13.225.193.58 Why is firefox ESR not able to resolve that domain? What are causes ?

Is is firefox dnslookuptool results.

I'm experiencing an intermittent issue with Firefox and I'm trying to figure out what might be causing it.

Occasionally, Firefox stops loading pages in new tabs. If I open a new tab and try to navigate to any website, it won't load, it'll state "waiting for www.[anywebsite].com" forever. However, if I use a tab that was already open before the issue started, I can still navigate to different websites from that tab without any problems.

The only reliable fix I've found is to completely close Firefox and start it again.

One strange thing I've noticed is that, sometimes while this issue is happening, if I put my laptop to sleep and then wake it up again, Firefox starts working normally, including in new tabs, without needing to restart the browser. But this isn't a something that works everytime.

I've already gone through the troubleshooting steps in the Mozilla Support article "Firefox can't load websites but other browsers can", but none of the suggested solutions resolved the issue.

I also tried disabling all my extensions, one by one, but the problem still occurs.

Has anyone seen this behavior before or knows what could cause it?

Additional information:

Firefox version: 152.0.2 (64-bit) (currently shows an available update requiring a restart, but it never seems to update even when enforced restarting) Operating system: Windows 1p Pro Version 10.0.18363 Build 18363

I'd appreciate any answers

how do i delete or remove the message about could connect error

Contributor note: See also /questions/1576275 for the detailed error message.

I am trying to be nice but it's should be going both ways . Server Not Found. Firefox can’t connect to the server at www.rebaid.com. AND YOU GIVING ME ADVICE: "Try connecting on a different device. Check your modem or router. Disconnect and reconnect to Wi-Fi." We both know that my router is not the problem nor my PC/device. It's you and you should harder to connect me with a page-site.

I cannot reach tennisonline.me website , I get error message 'Server not found' Can you advise / help me ? Thank you

I guess I'm hoping an engineer or someone who works on firefox can resolve this cause it's always what pushes what me away.

I'll be sick of Chrome harvesting all my data, I'll download firefox, and I'll set it up. A couple years ago I deleted my chrome profile and switched completely over to firefox. I want to say once a month, I'll open firefox and websites won't load. If they preload they'll act like they're offline.

It's happened to me on Windows machines and Mac machines.

If someone wants to seriously drill down and figure out why this happens across platforms and DECADES, I am happy to provide logs and video chat or something.

bold text When I try to go to my "FIREFOX" it answers me in French of course but here you don't accept to write me in French and so it's very difficult for me ... (could you help me for this of course ???) : "hmm this adress doesn' seem to be valid." Hum, cette adresse ne semble pas valide.

What must I do please ??? [edited from public] @orange.fr

I keep getting this message at the top of each site I go to: "You must log in to this network before you can access the Internet" It thinks I'm on a captive portal?? I'm at home on my own internet network. Why am I getting this message?

I need help with a problem that has tortured me for weeks. I use debian 13 with plasmakde. I don't know why, but when I connect to a wifi after some time it doesn't work anymore ONLY with Firefox. I can perfectly use any other app which requires internet but firefox. Sometimes it gives me the error "The connection has timed out", sometimes the error "Unable to find the proxy server" (even if I selected no proxy in the network settings). I searched online but I couldn't find anything helpful, so I can only hope to find a solution in here. Thank you very much in advance!

After Fire Fox does an upgrade for the next 3 to 4 days I cannot connect to web sites that circle just keeps spinning. Sometimes after about 20 to 30 minutes it might connect but then all I get is blank pages. Unfortunately I'm stuck with windows 10 for a while longer. Have tried most of the solutions refreshed 4 times and even reinstalled 3 times but doesn't change anything. Any ideas? Thanks

All too frequently, I receive messages as seen on the two enclosed screen dumps. When I click on the "Try again" button, I usually get through to the site I'm trying to reach. But today, I got the other response when attempting to log in to your site. Could that be another version of the usual response to all other sites. Could there be something that is intercepting my requests?

Best regards from Demark,

Eric Brown

P.S. I access the internet from a Lenovo Ideapad running Windows 11 fully updated.