Firefox Community Forum

My computer is running very slowly since I updated my Mac with Sequoia OS. I use Firefox . I have ATT/Yahoo mail service. Could it be related to Norton? What is the fix? What is the best high security search engine home page to use on my mac with Sequoia OS?

I have been unable to access any secure sites since I installed Norton 360 Antivirus. Whenever I try to access a secure site I receive the reply: Secure Connection Failed Error: PR_END_OF_FILE_ERROR I have tried all of the repairs listed on the internet but none have corrected the fault. I have also tried disabling Norton but also without success I have also tried uninstalling and re-installing Firefox but without success Can you suggest any other methods to correct this fault

I continually get error messages for webpages. I turn off my VPN, clear my history. Not sure what else I need to do. Last one was the webpage for Lindt Chocolate. Come on. Why am I getting error messages for this? I have been on this page before. There are other places also, like Macys. Getting fed up with Firefox.

My virus software [ESET] continues to throw a warning for this site: https://smartadblock.net/febc/check.php, whether in FireFox or not.

The full message is this:

03/05/2026 12:34:31 PM;HTTP filter;file;https://smartadblock.net/febc/check.php?smarterBlockeruser=5a95aca1-0bc7-44aa-8530-b24c4663d295&smarterBlockerch=75779&smarterBlockerclck=KYYhsXKkLAiq86nMniI_QBbvIGZ_3n5L;JS/Redirector.SWD trojan;connection terminated;TRANZFORMATION\wally;Event occurred during an attempt to access the web by the application: C:\Program Files\Mozilla Firefox\firefox.exe (83D3842D579E5B6E2E5B055CCA4FB90933489C28).;08C31D6E8BB70C29570A45FB6BCACD9881E3C0DF;;S-1-5-21-500642325-2770745265-1048253706-1001;

This just started yesterday 3/4/2026

Can someone advise me on this?

hello team, I currently locate in China. days ago i have tried a vpn called "Veee". since then i could not log in many websites. i have asked Veee team but they say they dont know. it really sucks. i also asked AI tool but none of the method works. i think the vpn has changed some settings of my Firfox. because i can actually log in those websites with Edge. but i only want to use firefox. the errors either "cant connect" or something like refusing my access. please help. i love you guys.

As mentioned, When google email account is open, opening another operative window, firefox automatically closes the email account. Why is this ? This looks to me as a possible bug or IE security program intervening to avoid cross connectivity and security violations between other opened windows. Correct ? This is annoying as an R&D engineer it is common to work with several opened windows. Any solutions or fixes ? rJ

I cannot access my xfinity account due to my anti-virus (Eset) blocking Firefox's access to assets.xfinity.com

Hello,

I'm using lasted version of Firefox Desktop and also using Kaspersky VPN. Whenever vpn is deactivated I cannot connect some websites. I just clicked and nothing happens. But if i tried with activated vpn, it's connecting.

I was trying to solve this problem but cant find solution.

PS. I did try on other browsers(Edge and Opera). I just connecting whatever is vpn status.

I am living in China and I used to be able to use a VPN with firefox without any problems.

Several months ago, I was suddenly only able to browse if I switched the VPN on (previously, it worked with or without (depending on whether the website was accessible from China).

I have recently changed VPN providers and now firefox doesn't browse at all.

Is there anything I should change in the settings?

Thanks

Why does Firefox think I am in Norway when I am in France? I use nordvpn for financial browsing but turn it off once I'm done. The VPN is not currently active, I have cleared cache and cookies and restarted Firefox and it still thinks I'm in Norway so search results are not accurate. Browser language is set to English and French. Thanks for any help in advance. UF

Firefox is not allowing me to reach links to medical portal websites to set up accounts saying they can't reach the site and perhaps a firewall is blocking it. I have other accounts on this same portal... HELP please.

Hello. I'd wriitten a few days ago about being blocked from firemountaingems.com I got help from Issis B. and was able to browse the site by turning off the VPN temporarily. Today, I am again blocked even with the temporary turn off of the VPN.

Is there a way you can show me easily step by step, how to exclude certain sites from the VPN permanently.

Thank you in adavance.

Error message: the bookmarks and history system will no be functional because one of Firefox's files is in use by another application. Some security software can cause this problem.

I tried following the directions in "learn more" but to no avail. Please help this senior citizen get his bookmarks back! Thank you.

I have disabled and removed any and all VPN's from my main unit. I have reloaded Firefox and cleaned the registry. Still getting the message and am unable to display images. Any ideas?

THE FOLLOWING SHOWED AFTER FIREFOX WAS UPDATED: NO SETTINGS HAVE BEEN CHANGEDTHE BOOKMARKS AND HISTORY SYSTEM WILL NOT BE FUNCTIONAL BECAUSE ONE OF FIREFOX’S FILES IS IN USE BY ANOTHER APPLICATION. SOME SECURITY SOFTWARE CAN CAUSE THIS PROBLEM.