Firefox 36 very slow connecting - Says "Connecting ...." - while other browsers work

since FF 36 users within our network have problems connecting to web sites.
Time to load the entire page is in the range of Minutes.
Same behavior for different users after upgrading to FF36.
Creating a new profile - same behavior
Using portable version - same behavior
enabled / disabled:
network.dns.disableIPv6
network.dns.disablePrefetch
network.http.spdy.enabled.http2
network.http.spdy.enabled.http2draft
- same behavior
Using managed F-Secure Client Security
No problems at all with Chrome and IE11.
Very odd - any idea?

Note that Firefox 36.0.1 has been released, so you can update and see if it works with the pref I mentioned above set to default.

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V4.0.1 suddenly stopped working ("unable to connect to server") while other browsers still work

Dell Dimension desktop, running Windows XP Pro, sp3; Pentium 4 2.8 GHz; 1 GB RAM; DSL on home LAN.
Have used Firefox almost exclusively, but it just stopped working today. No new applications installed. Downloaded and reinstalled Firefox to no avail.
Am able to access all sites using both Safari and Windows Explorer on the same machine.
When requesting a page, it immediately gives the error:
"Unable to connect
Firefox can't establish a connection to the server at..."
Doesn't take any time to try to connect, to find the server, etc.

That is an indication that a firewall is blocking the new version of Firefox. For details see [[Firefox cannot load websites but other programs can]].

Why Firefox warns about partially encrypted content while other browsers dont

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Try posting at the Web Development / Standards Evangelism forum at MozillaZine. The helpers over there are more knowledgeable about web page development issues with Firefox. <br />
http://forums.mozillazine.org/viewforum.php?f=25 <br />
You'll need to register and login to be able to post in that forum.

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Clear Cookies & Cache
* https://support.mozilla.com/en-US/kb/Template:clearCookiesCache
Clear the Network Cache
* https://support.mozilla.com/en-US/kb/How%20to%20clear%20the%20cache#w_clear-the-cache
Check and tell if its working.

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I've tried uninstalling, including all personal information, etc., then reinstalling without any importing of external data-- in other words, a very fresh and clean installation. Still, I can't get Silverlight to run at the Fidelity site. Internet Explorer and Chrome work just fine. What's going on here?

Thanks for the suggestions. Unfortunately, none of them solved the problem. The problem persists. Silverlight acts like it wants to start. In fact, it seems like it is just starting when it always shuts done and presents a blank screen. Still don't get it. Anybody have any other ideas?
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'''Try the Firefox Safe Mode''' to see how it works there. The Safe Mode is a troubleshooting mode, which disables most add-ons.''
''(If you're not using it, switch to the Default theme.)''
* You can open the Firefox 4.0+ Safe Mode by holding the '''Shift''' key when you use the Firefox desktop or Start menu shortcut.
* Or use the Help menu item and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
''Don't select anything right now, just use "'Start in Safe Mode"''
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut (without the Shift key) to open it again.''
'''''If it is good in the Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one.
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I own a 13-inch MacBook Pro and for the past day, my wifi on my laptop says I only have two bars of connection and is running very slow,but all of my other devices such as my iPhone and iPad are connecting perfectly to the wifi. How can I fix this? Thanks

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FCP, and all software on OSX, has a few different "preference" files (the extension is .plist), which store all your user settings. Each time you resize a window, change a setting, anything, this file is re-written. Kinda easy to see how they would become corrupt every now and then.
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Download FCP Rescue to make this process easier in the future. When you have FCP running really smooth, open FCP Rescue and create a backup of your preference files. If it starts acting wanky, just run FCP Rescue and Restore your backup preferences. Works really slick, and it's free.
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I have a problem when i am connecting my mbpr to a monitor , the internet is going very slow when i connect to the monitor plz help me if i buy a vga to minidisplay it will help??

i have a problem when i am connecting my mbpr to a monitor , the internet is going very slow when i connect to the monitor plz help me if i buy a vga to minidisplay it will help??

dovdov2,
are you saying that when you connect your MacBook Pro to a monitor, your Internet connection slows down, but when you disconnect the monitor, it speeds up again, and that this is reproducible from one day to another?
Does this happen both under OS X and under Windows 7, or only under one of them?
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Some of you will want to shoot me; Mozilla may yank this reply. BUT I had the same problem for about a week, struggled in vain, poured over the help section and got 3 replies to my posted question. Nothing, absolutely nothing worked.
Want to know what solution I finally came up with? '''''CHROME.'''''
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I don't want to stay with iOS 7 any more, i can't tolerate it to being very slow and to hand while playing games, it doesn't run properly, i have no games in my phone right now becouse of that bug, could i downgrade my ios of iphone 4s? Please help thanx

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That is HANG sorry miss type

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I just recently got a new Dell XPS 15 (2014 model) with windows 8.1 Everything works smooth except firefox. It's very slow, sluggish and unresponsive. It takes several seconds to start up and every time i load a site I have to wait for it to respond to any input. All the other browsers work fine.
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you need to enable Pipelining , please follow the instructions on this videos and you'll get it right .
link : [https://www.youtube.com/watch?v=MhdPtqpuu74 Youtube ]

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2. Spybot Search & Destroy - http://www.safer-networking.org
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What version of Mac OS X?
What home page?
What browser?

Firefox 36 very slow connecting - Says "Connecting ...." - while other browsers work

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