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  • Slow connection

how do i clear the cashe

Firefox Buffering contiuiously using aMac book air error " not enough band width " i ve switched to another machine Mac book pro " bbc iplaye"r str… (続きを読む)

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.

Open 1

Downloads Are Slow

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 fr… (続きを読む)

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.

Open 1 18

Internet connectivity

I have been using Firefox for a number of years. I use it with Windows 10. My internet connectivity has recently degraded to the point it is no longer viable. It is painf… (続きを読む)

I have been using Firefox for a number of years. I use it with Windows 10. My internet connectivity has recently degraded to the point it is no longer viable. It is painfully slow and I keep getting "time out' notifications. I contacted my service provider and they suggested using a different browser. Although I was skeptical, I installed Chrome on my machine and tried it. Connectivity is back to normal. Why? What happened to Firefox? It shows as being up to date. How can I fix it?

Open 36

Intermittent HTTP/2 connection stalls in Firefox while Chromium browsers work normally

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 m… (続きを読む)

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.

Open 1 135

Low internet speed via Firefox.

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… (続きを読む)

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.

Open 7 227

something is beoken

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 brows… (続きを読む)

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

Open 1 81

Why is my firefox browser so slow?

My browser has been acting off lately, it takes a longer amount of time than usual to even open gmail. Sometimes, it just fails to connect to a server and keeps loading f… (続きを読む)

My browser has been acting off lately, it takes a longer amount of time than usual to even open gmail. Sometimes, it just fails to connect to a server and keeps loading forever and just stops (including gmail).

Open 1 256

Youtube is incredibly slow, when no other programm (i.e. steam) is downloading in the background

Hi Firefox Team, I wanted to ask, whether you know any solution to my streaming problem. I noticed that my download speed is incredibly fast, when I am running a download… (続きを読む)

Hi Firefox Team,

I wanted to ask, whether you know any solution to my streaming problem. I noticed that my download speed is incredibly fast, when I am running a download in the background of my PC. This can be a windows-update or updating a game via steam. But when I am not downloading anything, then Youtube cant even stream 360p without buffering every 10 seconds. I feel like the Firefox-Browser is not telling my PC that it needs the internet and thus does not get it, but when another program needs internet, It gets enough to work.

Open 1 119

Slow upstream bandwidth

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. … (続きを読む)

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.

Open 1 193

Too slow to download by firefox with LAN

I'm on the local network. When I use Firefox to download a very small .docx file, the download gets stuck and doesn't move, taking a while to complete. But with Edge, it … (続きを読む)

I'm on the local network. When I use Firefox to download a very small .docx file, the download gets stuck and doesn't move, taking a while to complete. But with Edge, it downloads almost instantly. Please help resolve this issue.

Open 3 275

Buffering in Mac

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 … (続きを読む)

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.

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Firefox Upload Speed Severely Bottlenecked (1/4th of ISP Speed) on Windows - All Troubleshooting Exhausted - Other Browsers/Apps Fine

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 … (続きを読む)

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:

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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.

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

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

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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.

アーカイブに保管済み 3 387