See if this helps... Make the change in about:config

network.http.request.max-start-delay 2

Nope didn't help. Thanks anyway

I've discovered that the problem seems to be Flash, Firefox works fine when I disable it the problem is though I mostly use Firefox for watching Youtube so disabling flash isnt really an option. Any ideas on how to fix it? I've tried uninstalling and reinstalling flash which didnt help

I'd uninstall it, then use ccleaner (www.ccleaner.com) to remove the registry info.. Reboot and then reinstall it..

Nope still not fixed

A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.

Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.

See:

• https://support.mozilla.org/kb/Server+not+found
• https://support.mozilla.org/kb/Firewalls

Create a new profile as a test to check if your current profile is causing the problems.

See "Basic Troubleshooting: Make a new profile":

• https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile

There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.

If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.

See:

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Thanks, that first one seems to have fixed the not responding problem but Youtube videos still wont load, I just get black box

If you right click on the video, and go to global settings.. Make sure the storage is set to "Allow Sites to save information..."

Do you have the 32 bit version of the Flash player installed?

You can find the 32 bit version of the Flash Player installer for a 32 bit Firefox version here (scroll down to Flash Player (32 bit)):

• http://www.adobe.com/special/products/flashplayer/fp_distribution3.html

If you use extensions (Tools > Add-ons > Extensions) like Adblock Plus or NoScript or Flash Block that can block content then make sure that such extensions aren't blocking content.

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

I'm an idiot guys, turns out Youtube videos are working fine and it's just the videos from one channel that arent working, I never thought to try any other videos. Thanks for the help anyway

Good to hear it's fixed...