Web sites tell me that I can't use websockets

Hey,.
mutiple sites tell me that the browser does not support websockets.
First of all, I saw this in the add-on pushbullet. Here, I thought it was a problem specific to the site.
But now I tried IPython notebook and the error came back.
I tried http://www.websocket.org/echo.html and the same once again.
But http://caniuse.com/websockets told me that it should be supported.
Checked in normal and safe mode, so it's not a problem to Add on.
Firefox developer works with this sites.

Here, the system of the form:
Archlinux x 64 fully up-to-date

The troubleshooting below information button seems not to do his work so I add here:
{

 "application": {
   "name": "Firefox",
   "version": "33.1.1",
   "userAgent": "Mozilla/5.0 (X11; Linux x86_64; rv:33.0) Gecko/20100101 Firefox/33.0",
   "supportURL": "https://support.mozilla.org/1/firefox/33.1.1/Linux/en-US/",
   "numTotalWindows": 1,
   "numRemoteWindows": 0
 },
 "lockedPreferences": {},
 "graphics": {
   "numTotalWindows": 1,
   "numAcceleratedWindows": 0,
   "windowLayerManagerType": "Basic",
   "windowLayerManagerRemote": false,
   "numAcceleratedWindowsMessage": [
     ""
   ],
   "adapterDescription": "NVIDIA Corporation -- GeForce GTX 560 Ti/PCIe/SSE2",
   "adapterVendorID": "NVIDIA Corporation",
   "adapterDeviceID": "GeForce GTX 560 Ti/PCIe/SSE2",
   "adapterRAM": "",
   "adapterDrivers": "",
   "driverVersion": "4.4.0 NVIDIA 343.22",
   "driverDate": "",
   "webglRenderer": "NVIDIA Corporation -- GeForce GTX 560 Ti/PCIe/SSE2",
   "info": {
     "AzureCanvasBackend": "cairo",
     "AzureSkiaAccelerated": 0,
     "AzureFallbackCanvasBackend": "none",
     "AzureContentBackend": "cairo"
   }
 },
 "javaScript": {
   "incrementalGCEnabled": true
 },
 "accessibility": {
   "isActive": false,
   "forceDisabled": 0
 },
 "libraryVersions": {
   "NSPR": {
     "minVersion": "4.10.7",
     "version": "4.10.7"
   },
   "NSS": {
     "minVersion": "3.17.2 Basic ECC",
     "version": "3.17.2 Basic ECC"
   },
   "NSSUTIL": {
     "minVersion": "3.17.2",
     "version": "3.17.2"
   },
   "NSSSSL": {
     "minVersion": "3.17.2 Basic ECC",
     "version": "3.17.2 Basic ECC"
   },
   "NSSSMIME": {
     "minVersion": "3.17.2 Basic ECC",
     "version": "3.17.2 Basic ECC"
   }
 },
 "userJS": {
   "exists": false
 },
 "extensions": [
   {
     "name": "Add to Amazon Wish List Button",
     "version": "1.10",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "Cert Alert",
     "version": "0.0.8",
     "isActive": false,
     "id": "{c45ac2c6-14d5-11df-844d-001f16155cce}"
   },
   {
     "name": "Clean Links",
     "version": "2.6.1.0",
     "isActive": false,
     "id": "{158d7cb3-7039-4a75-8e0b-3bd0a464edd2}"
   },
   {
     "name": "Click to Play per-element",
     "version": "0.0.7",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "Disconnect",
     "version": "3.14.0",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "DuckDuckGo Plus",
     "version": "0.4.6",
     "isActive": false,
     "id": "jid1-ZAdIEUB7XOzOJw@jetpack"
   },
   {
     "name": "Expiry Canary",
     "version": "1.1",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "FlashGot",
     "version": "1.5.6.8",
     "isActive": false,
     "id": "{19503e42-ca3c-4c27-b1e2-9cdb2170ee34}"
   },
   {
     "name": "Force-TLS",
     "version": "4.0.0",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "FoxyProxy Standard",
     "version": "4.4.1",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "Ghostery",
     "version": "5.4.1",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "KDE Wallet password integration",
     "version": "2.4",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "Lightbeam",
     "version": "1.1.0",
     "isActive": false,
     "id": "jid1-F9UJ2thwoAm5gQ@jetpack"
   },
   {
     "name": "NoScript",
     "version": "2.6.9.5",
     "isActive": false,
     "id": "{73a6fe31-595d-460b-a920-fcc0f8843232}"
   },
   {
     "name": "Pentadactyl",
     "version": "1.1",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "Personas Plus",
     "version": "1.7.3",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "Perspectives",
     "version": "4.5.2",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "Private Tab",
     "version": "0.1.7.3",
     "isActive": false,
     "id": "privateTab@infocatcher"
   },
   {
     "name": "Pushbullet",
     "version": "37",
     "isActive": false,
     "id": "jid1-BYcQOfYfmBMd9A@jetpack"
   },
   {
     "name": "RequestPolicy",
     "version": "0.5.28",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "Safe",
     "version": "1.1.2",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "Self-Destructing Cookies",
     "version": "0.4.6",
     "isActive": false,
     "id": "jid0-9XfBwUWnvPx4wWsfBWMCm4Jj69E@jetpack"
   },
   {
     "name": "Send to XBMC",
     "version": "1.2",
     "isActive": false,
     "id": "jid0-YCM0p5WlCGjvBJcZhAusQ5h26wM@jetpack"
   },
   {
     "name": "Stylish",
     "version": "1.4.3",
     "isActive": false,
     "id": "{46551EC9-40F0-4e47-8E18-8E5CF550CFB8}"
   },
   {
     "name": "Troubleshooter",
     "version": "1.1a",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "Turn Off the Lights",
     "version": "3.0.0.16",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "User Agent Overrider",
     "version": "0.2.4",
     "isActive": false,
     "id": "[email protected]"
   },
   {
     "name": "Vimperator",
     "version": "3.8.3",
     "isActive": false,
     "id": "[email protected]"
   }
 ],
 "experiments": []

}

Ok. Another profile solved this problem.
It was a simple setting that has been set to false.
I think it was a fragment of firefox 4/5 (yes my real config have its root in the firefox 3 xx times), there was simply the key network.websocket.enabled the value false, and I never used it until now.
So I'm able to keep my good old config and just change it in all: config.

So, if anyone has the same problem:
Before resetting the configuration, or worse still the whole profile:
-Open the link "subject: config ' in the browser
-Locate the key: network.websocket.enabled
-Check if it is set to true (the default)

Tags: Firefox

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