Firefox Community Forum

Hello everyone,

I'm looking for ways to troubleshoot streaming video issues in Firefox. Sometimes video playback can be affected by browser settings, the internet connection, or device performance.

What steps should I follow to identify the cause and improve playback?

I also came across Selvydia while researching IPTV and streaming services. Would browser troubleshooting differ depending on the streaming platform being used?

Thank you for any practical suggestions.

I've been using firefox for a little while- maybe three months now. I'm no expert on any of the config options. I run firefox using the built in VPN that my friend showed me how to enable, and I've been using it since. But now, as of roughly today, whenever I enable the VPN, no websites will load. At all. When I turn it off, they load instantly. But whenever I turn it on, it just gets stuck loading forever and ever, never actually getting anywhere. I tried enabling network.dns.disableIPv6 in the config page, because that's what I saw on a mozilla support page- nothing. Didn't do anything. The browser.ipprotection.enabled is still on, and I didn't change anything in settings. There was a firefox update very recently, but everything still worked with the VPN on. I just updated my computer, but I don't think that's it either because it wasn't loading things earlier today either. Not sure how to fix this. Please help?

Hi Mozilla team & community,

I am facing a persistent video playback issue specifically in Firefox (latest build on Windows 11), while the exact same stream plays flawlessly on Google Chrome and VLC media player.

When attempting to stream high-definition HLS live content from my media portal site (https://bidarn.com), the video stalls and buffers every 10–15 seconds. Upon inspecting the Firefox Web Developer Console (Network tab), I notice frequent `NS_ERROR_NET_TIMEOUT` errors during the loading of .ts media chunks, along with occasional CORS flags during concurrent HTTP requests.

I have already completed the following standard troubleshooting steps: 1. Disabled Enhanced Tracking Protection for the domain. 2. Started Firefox in Troubleshoot Mode (Safe Mode) with all extensions turned off. 3. Cleared all cookies, site data, and browser cache. 4. Tested with hardware acceleration toggled ON/OFF.

Unfortunately, the segment fetching latency remains high in Firefox.

Are there specific parameters in `about:config` (such as adjusting `network.http.max-persistent-connections-per-server` or expanding `media.cache_size`) that can optimize how Firefox handles parallel HLS segment fetching?

Any technical guidance or network config recommendations would be greatly appreciated.

Hi; I use Firefox on my phone and my laptop both. In my laptop (Lecoo pro 14, Ubuntu 26.04) in a domain range browser gives me security alarm and don't let me get in. This is normal but when I use other browser in my laptop or Firefox on my phone (s25 ultra) there is no problem at all and it works well! I tried all things. run commands like: sudo snap remove --purge firefox | sudo snap install firefox, sudo apt search firefox/mozilla and than reinstall all installed packages and clear all caches on settings. But none of them worked. Thanks for your responsibility and making such great open-source app.

Not a question just feedback but the new UI you made for the browser in the new update looks really bad and really sucks I don't know why or what anyone was thinking designing it. The blocky styles were fine before not gonna lie. :/

After the last update the tabs are rounded instead of square. Where can I find the option to switch it back? If there isn't one, please add it back as an option in the next update.

Die Deutsche Bank teilt mir mit, daß ich mit GoogleChrome mich anmelden soll, weil mit Firefox geht das nicht mehr. Was ist los mit Firefox ? Einstellungen ? und ich will einen Flug buchen bei Thai Airways ich komme auf die website rein gebe meine Daten ein und dann bei suchen nach Flügen geht nichts mehr auch hier die Antwort, probieren Siees mit Google Chrome. und mit Chrome funktioniert es

I love using picture-in-picture, but there are times when I want the video I'm watching to keep playing, but not pop out into the PiP and cover part of the screen I'm focusing on. I wish there was a way for me to keep the option to use the PiP, but not have it forced any time I want to switch tabs. I looked pretty hard and couldn't find any info, but if I'm just missing it and could be pointed in the right direction, I'd be super grateful!