Firefox Community Forum

I get scam messages that say "Trojan virus detected!" on Mozilla Firefox which I cannot delete. I have run antivirus scans which show there is no virus or malware. I have shut down the desk top. How can I go to reinstall Mozilla Firefox default settings or do you have another solution?

normally i just click the forefox icon on my taskbar and type claude.ai in the address field but today i was messaged that the claude program needed a mozila account - so I had to set one up. why and still cannot get to Claude

I receive this Error msg trying to access Settings option in the AJC epaper section https://editions.ajc.com/shortcode/AJC412/edition/f117d96a-c78b-4df3-4b6a-0e587f6cfd22 on a Firefox Browser:

Application error: a client-side exception has occurred (see the browser console for more information).

Webgl has completly broken after last update for me. Forcing webgl in about config doesnt work and it doesnt work in troubleshoot mode either. Anything else i can try apart from reinstall from scratch as im worried about losing my history,saved account info and such. Or do i just need to do a full refresh and install? Thank you!

I'd like to ask about Firefox's behavior and settings. I'm using Firefox with vertical tabs (using an add-on), but it seems to be behaving strangely. The things that have changed since before are: 1. Open from pinned tab 2. Now opens in a new tab → Previously it opened in the same tab 3. Clicking on a newly opened tab opens a new tab again → Previously it would open pinned tabs/same tabs → in a new tab It has changed. I haven't changed any of my Firefox settings. Windows 11 Home 23H2 Firefox version 139.0.4 (64-bit).

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.

https://e-nidhi-v2.bihar.gov.in/rms-portal-ui/rms_ReceiptCreation?encData=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&merchant_code=REGISDEPT

Peer’s Certificate issuer is not recognized.

HTTP Strict Transport Security: false HTTP Public Key Pinning: false

Certificate chain:

MIIHITCCBQmgAwIBAgIPe9HbuzjrJVIH/vX63YhtMA0GCSqGSIb3DQEBDAUAMFMx CzAJBgNVBAYTAklOMSUwIwYDVQQKDBxlTXVkaHJhIFRlY2hub2xvZ2llcyBMaW1p dGVkMR0wGwYDVQQDDBRFTSBEViBUTFMgQ0EgLSBHMkEtMTAeFw0yNTEwMDMxMTMw MzhaFw0yNjEwMjgxMTMwMzhaMBkxFzAVBgNVBAMMDiouYmloYXIuZ292LmluMIIB IjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuGmKn0XZAyekVrpXOZbaqwZq db2M18Z26Xv5oWljfLD8eBFQxjQMGtL5C/+lLarXCvr2F2CRA7Xp7Fyj7VLFeAmJ j2z6QMucxpHa13bRkBXy/lqurC4J4stfsMhtL5RWsztSsRtnAoPwbopgWvw/BDnW 0bh7E8pOUY1ePz577iRDj3WGVUryTa33HiAvEJdPmUB4XiiYBMIZhyl6x7iS9NQj gOg5quPNI2YI1NwrD7vB20/6t63muTkVCD4LGdb0+yotQn7DQ0MyA5oATifHCWpD fS1N5+7jSaTqPgPpz+8KV8gpHieO2a1Omz3icjJk8uT6O9/mJYAKK2wx2WgDpQID AQABo4IDKjCCAyYwHwYDVR0jBBgwFoAUE1weGJYNA3nLBAmvj50U0C6223AwHQYD VR0OBBYEFJuz/Oeksa16P2P29qOoAckGUTaVMBMGA1UdJQQMMAoGCCsGAQUFBwMB ME8GA1UdIARIMEYwOgYMKwYBBAGDjiEBAAEBMCowKAYIKwYBBQUHAgEWHGh0dHA6 Ly9yZXBvc2l0b3J5LmVtc2lnbi5jb20wCAYGZ4EMAQIBMHgGCCsGAQUFBwEBBGww ajAkBggrBgEFBQcwAYYYaHR0cDovL29jc3AtYS5lbXNpZ24uY29tMEIGCCsGAQUF BzAChjZodHRwOi8vcmVwb3NpdG9yeS5lbXNpZ24uY29tL2NlcnRzL0VNRFZUTFND QUcyQTFFRS5wN2MwOAYDVR0fBDEwLzAtoCugKYYnaHR0cDovL2NybC5lbXNpZ24u Y29tP0VNRFZUTFNDQUcyQTEuY3JsMCcGA1UdEQQgMB6CDGJpaGFyLmdvdi5pboIO Ki5iaWhhci5nb3YuaW4wDgYDVR0PAQH/BAQDAgWgMAwGA1UdEwEB/wQCMAAwggGB BgorBgEEAdZ5AgQCBIIBcQSCAW0BawB3ANgJVTuUT3r/yBYZb5RPhauw+Pxeh1Um DxXRLnK7RUsUAAABmanWpcUAAAQDAEgwRgIhAO10xa+Gco+QGukLk1vRoEl88r2x eIJNe/hkH2AL7b6dAiEA/gp3Cw0Lr1QMDsZE4hc+fuDfJ8atDBdUMpZAeZkNevEA dwDLOPcViXyEoURfW8Hd+8lu8ppZzUcKaQWFsMsUwxRY5wAAAZmp1qtrAAAEAwBI MEYCIQDwG25Z2OCbiH8wVer36fVvfeJJiAG4i3LLSdNi9IfiEQIhAK2VZFgXFWd+ FTv3uazObtb5uicEUBVVwTpk/9cLoOMzAHcArKswcGzr7IQx9BPS9JFfER5CJEOx 8qaMTzwrO6ceAsMAAAGZqda2UgAABAMASDBGAiEA8AIF2gnkDl9r6HsYTATYbvzQ g/lq5i8B/MqENBs5dkwCIQC05B2VIIKRq185Z9HUiriglD4OeBz+X9ixCZQOseD7 yDANBgkqhkiG9w0BAQwFAAOCAgEABY9VYC2YHUNHebWF54NWm7dp9p86ZNyZyl7m bXNcbmUazeb5L/5qRjgacVdzIK3/BHc50eEtgFfhCjmwrx4vJG1fqRTFrPgPjSfx Sbx1X4tPZE5aMwtsoL+qOZAWARwNQcU2H6q5zAUj5yMNGVwEyIsuaerJBayImYGZ DDv9XPnMqjrwTMAF3sjfnLVEbVf4JrgJzb5cDrOY1BfGFPj3j5gw5cOljjqnGuKi kOdtxtsI2wLxjnHSYRLDl/NiZxaIhgJiCO6alJ44uRv9e2XeYJO4goagiK7lvISb jfqmU1pSEPlivfhKYDWNJ5d07TQjIj24YJnwboko23JneyjnOhqUXyihLp/9LbVI 6ShhvMEyBn2cWd++xnmXcMSdHXmABE3xs+2f7wiFnEIGFxoXiljCnRQ72S18gU9U XjxN1aaeZEC2n1XJh2yFlfXgcdDe2wHQIAnyNIzKpfAIMniDuZbxZS9NmeO6f2wR 4sVucfIQ2GZz6opgp2NGUfv95Yezc6q2emXFsjlySv8ycqiCAFUNwd8AF2BxN9dq FOLn5Nb7faorNG7P+l+DUoK21lNLcuyy0MXhX5Wte3W4WtJstBWAQG6Vm3z9aj7P j8HrnpEJHoEsIpQCn8tDIut69YEj8WC1PjD/ZWQBV6PKdvb7bSlMtuPhwBtJwIXK CI8wXto=

I’ve been troubleshooting a strange networking issue in Firefox that I haven’t been able to pin down, and it seems to be specific to Firefox’s network stack rather than my system or connection.

On several high-traffic sites that sit behind Cloudflare (Discord, Shopify storefronts, some SaaS dashboards), Firefox occasionally stalls during page load. The request shows up in the Network panel as pending for several seconds before finally completing. Sometimes the page partially renders and then hangs until the stalled requests finish.

A few things that make this confusing:

• The same sites load instantly in Chromium-based browsers on the same machine and network • The issue persists even in Firefox Troubleshoot Mode with extensions disabled • DNS over HTTPS on/off does not appear to change behavior • Packet captures show the TCP connection is established quickly, but some HTTP/2 streams appear to wait before data begins flowing • If I force HTTP/1.1 using a proxy for testing, the issue disappears

System details:

OS: Windows 11 Firefox: latest stable release Connection: fiber, low latency, no packet loss locally No system proxy configured

Things I’ve already tried:

• Clearing cache and site data • New Firefox profile • Disabling hardware acceleration • Testing with network.http.http2.enabled toggled • Comparing HAR logs with Chromium

One thing I noticed in the Firefox networking logs is that multiplexed streams sometimes wait behind earlier streams longer than expected, almost like there’s some internal prioritization or queue behavior happening. I’m wondering whether this could be related to HTTP/2 prioritization logic, connection coalescing, or how Firefox handles Cloudflare edge endpoints.

Has anyone seen similar behavior or knows whether there are any advanced networking prefs in about:config worth experimenting with (connection limits, HTTP/2 concurrency, etc.)?

Curious if this might be a known quirk with certain CDNs or just something unique to my environment.

Recently transferred from Chrome. My understanding was Firefox private browsing was supposed to work similarly to chrome incognito mode; once you close the browser, all local files are deleted and cookies are cleared.

However, with Firefox it maintains my logins. If I log into an account while private browsing and the close the browser, I’ll still be logged in next time I go to the website even if it’s days later (and I have never logged into this account in a non-private browsing window!)

I never had this issue using chrome incognito, so it seems to be a Firefox problem.

Is this just not something Firefox supports? Is there any way to prevent storage of cookies and private data?

Whenever i search something on google, firefox desktop (all fine on android) is failing to display the ai(gemini) answer no matter what questions i ask.

Same happens in the "AI Mode" option that is available in google's recent update.

And, I,m logged in.

This started since a week, everything was working fine before that.

Adding the images below.

I cannot sign into my att/yahoo email while using Firefox. After calling AT&T they told me to use Microsoft Edge which I told them I would not! When trying to sign in I receive the error message "It's not you, It's us" try again. It is my belief that att is trying to coerce me to change browsers so they can spy on me

Hello, I am suffering from an odd issue when using twitch.tv. In short, when viewing peoples streams, my video feed will usually turn into colorful static (aka "clown vomit"). I suspect that the issue is coming from Firefox, but I can't be certain. I am using a newly-bought laptop and the issue could be caused by a large number of things, theoretically. Here is what I know:

• When viewing on twitch.tv with quality 360p or higher, the video feed will usually (95%) become colorful static within 1 minute or less. When this happens, the video feed does not ever recover until page is refreshed or quality is changed. (I know a bit about video encoding, so this seems extremely odd to me, if it were due to a networking thing that lost some packets, a full-image frame should come alone sooner or later and fix things, but that never seems to happen)
• The video feed is far less likely to become corrupted when viewing at 160p, but can still happen.
• The ads may become corrupted in the same way that the main video feed can.
• When the feed is corrupted, the rest of the Twitch interface (pause/play, volume, quality select) is extremely laggy.
• When the feed is corrupted, if I pause the stream, sometimes the paused corrupted image is not completely stationary! There will be flickering in small portions of the image, looking similar to texture fighting in 3d rendering, flickering between two equally-but-differently corrupted versions of the image
• The issue never appears when using Chrome to watch twitch.tv. This is what makes me think Firefox is the culprit, not Twitch or networking or graphics drivers.
• Disabling my browser addons does not help.
• Private browsing window does not help.
• Clearing my browser cache does not help.
• I have had the issue happen on Youtube exactly once in 2 weeks, not sure if that's related or not, I think it was a normal "lost some network traffic but fixed itself the next time a full frame was received" thing.
• Video live streams on Youtube don't get corrupted the way they do on Twitch.

Can someone please give me advice for how to fix this? Has anyone seen anything like this before? Is there a way for me to get deeper under the hood of either Twitch or Firefox and more closely debug the video stream when it fails?

duplicate of /questions/1466153 thread

I thought I had solved this by adding the website to the "safe" list - I really cannot say how frustrating this is if I am being locked out of even safe sites. - This is a browser issue (I'm not that naive).

There is no real response from Moacilla(Firefox) here apart from throwing the Rulebbok at me and saying "Read!". I can only do so much Tune ups" and shut downs and ensure drives are functional. Please advise on the Browser Cache situation, rspecially as BBC iPlayer is added to the "Safe List" and yet still throws up the 400 Bad Gateway error message - an early reply would be useful.