Firefox Community Forum

This is a recent problem but when I try to open new tabs they don't load or take a very long time to load. I wind up shutting down my computer and resarting but sometimes that doesn't help. it seems to be getting worse. I do not use any other VPN but yours and Duckduckgo to search. I use a macbook air. Any suggestions? Thanks

Hello :D

I seem to e having a problem with Firefox in that whenever I use it, my entire internet slows down to barely a crawl. I have tried several things, including turning off efficiency mode in the config.

I have tried various DNS and Proxy fixes I've seen on reddit and these forums, including turning of proxy and dns over https as well as reinstall the browser. It is only firefox that does this to my network.

I got Windows 11 Home edition and my network is a fiber network

Any help would be appreciated.

Since the last update on both my desktop and laptop web performance has slowed considerably. Some sites time out, some just don't connect. I've tried VPN on and off, changed security levels, deleted extensions to no avail. I use Windows 10. Is this the future with FF? Time, after many years using FF synced across all my devices, to bail?

Please advise soonest as this is more than frustrating and unproductive. Thanks Stephen

I have explored every option and find it is the latest FF update that has effected the web performance of both my Desktop and laptop. Both are running Windows 1O. Incredibly slow connectivity and some sites either time out or simply won't connect. Very frustrating. Please advise. Tks

Firefox Buffering contiuiously using aMac book air error " not enough band width " i ve switched to another machine Mac book pro " bbc iplaye"r streming normally.

Downloads on Firefox are slow. They used to be fast, but about three days ago they just went way down to about a tenth of the previous speed. I've tested the same file from the same source and on Edge it downloads at the speed I used to get, so it's a problem with Firefox.

The server at biz209.vodien.com:2096 is taking too long to respond.

Moderator note: This question has been edited to correct the link formatting.

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.

Home Internet speed via cable 500 Mbps. When checking the Internet speed through the Firefox browser (version 133.0.3), incoming and outgoing about 250 Mbps. That is, the browser cuts the speed twice. When checking the speed through Google Chrome (version 145.0.7632.160), the Internet speed is about the declared 500 Mbps. Please help solve the problem with Internet speed through the Firefox browser.

Now a days every one use proxy vpn when it starts speed of net is dead browser can not work or very slow working that's why people are experimentally with different browsers to see which one does not slowdown even in slow net speed

I can use edge and my speed tests perfect on speed test. If I use Firefox the upstream is half. I only have block installed but doesn't matter if I disable or not.

On Mac but not on Safari Firefox buffers for minutes before connecting. I’ve tried clearing the cache with no improvement. Until recently I never had this problem and as I said there’s no problem on Safari.

Hello,

I am having major issues with Firefox speeds, Mainly upload speeds. On Edge I am getting 400 up & down (no issues at all). However, on Firefox upload speed is 144 Mbps, same on private windows. The only issue is with Firefox. Windows is up to date and Firefox version is 139.0.4 (64-bit)

Attached comparison screenshots for reference.

Below are the steps i performed:

=========================

Firefox Troubleshoot Mode Test: Download: 411.71 Mbps (Full Speed) Upload: 173.03 Mbps (Still Bottlenecked) Extensions Disabled Manually (Normal Firefox): No significant improvement. Hardware Acceleration Toggle (Normal Firefox): No significant improvement.

=========================

New Temporary Firefox Profile Test: Download: ~333 Mbps Upload: ~190 Mbps Problem persists even with a clean profile.

=========================

Temporarily Disable Windows Firewall Test: Resulted in ~349 Mbps Down / ~148 Mbps Up. Firewall re-enabled.

=========================

Could someone let me know how to get this fixed. Creating a new profile should have fixed issued assuming one of the extensions was causing the bottleneck. But even with a new profile its not making any difference.

Once I visit any web site that uses HTTPS there is approximately a 90% chance it'll take seconds or even minutes to secure the connection. This never happens on other browsers as they load such pages instantaneously.

I already cleaned my data up and removed the extensions, both suspected and innocent bystanders, to no avail.

As stated in the title, I'm using Firefox 139.0.1 x64 on Windows 11 (24H2, build 26100.4061). This started happening after an automatic Firefox update, I never changed anything in my system configuration.

I'm using Mac OS 11.7.10. Firefox desktop no longer allows me to browse the internet. It just keeps spinning wheels. I've downloaded the newest version and it still crashes. What can I do?