hello, can you try to replicate this behaviour when you launch firefox in safe mode once? if not, maybe an addon is interfering here...

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

i tried but same

can you give us the exact wording of the error message?

in addition, could you go to the firefox menu ≡ > help ? > troubleshooting information, copy the contents of that page and paste them here into a reply on the forum? this might give us a clue what is going on...

What security software (firewall, Anti-Virus software) do you have?

philipp said

can you give us the exact wording of the error message? in addition, could you go to the firefox menu ≡ > help ? > troubleshooting information, copy the contents of that page and paste them here into a reply on the forum? this might give us a clue what is going on...

when i open GMail it gives: JavaScript must be enabled in order for you to use Gmail in standard view. However, it seems JavaScript is either disabled or not supported by your browser. To use standard view, enable JavaScript by changing your browser options, then try again.

To use Gmail's basic HTML view, which does not require JavaScript,

.

If you want to view Gmail on a mobile phone or similar device .

When i open facebook it gives : JavaScript Required We're sorry, but Facebook doesn't work properly without JavaScript enabled. If you can't enable JavaScript, try visiting the mobile-optimized website.

here is data {

 "application": {
   "name": "Firefox",
   "version": "42.0",
   "buildID": "20151029151421",
   "userAgent": "Mozilla/5.0 (Windows NT 6.1; rv:42.0) Gecko/20100101 Firefox/42.0",
   "safeMode": false,
   "updateChannel": "release",
   "supportURL": "https://support.mozilla.org/1/firefox/42.0/WINNT/en-US/",
   "numTotalWindows": 1,
   "numRemoteWindows": 0,
   "remoteAutoStart": false
 },
 "modifiedPreferences": {
   "browser.cache.disk.smart_size.first_run": false,
   "browser.cache.disk.smart_size.use_old_max": false,
   "browser.cache.disk.capacity": 358400,
   "browser.cache.disk.filesystem_reported": 1,
   "browser.cache.frecency_experiment": 3,
   "browser.download.importedFromSqlite": true,
   "browser.places.smartBookmarksVersion": 7,
   "browser.sessionstore.upgradeBackup.latestBuildID": "20151029151421",
   "browser.startup.homepage_override.mstone": "42.0",
   "browser.startup.homepage": "about:home",
   "browser.startup.homepage_override.buildID": "20151029151421",
   "dom.apps.reset-permissions": true,
   "dom.mozApps.used": true,
   "extensions.lastAppVersion": "42.0",
   "gfx.direct3d.last_used_feature_level_idx": 0,
   "gfx.driver-init.feature-d3d11": true,
   "gfx.driver-init.deviceID": "0x0102",
   "gfx.driver-init.driverVersion": "9.17.10.3347",
   "gfx.driver-init.status": 2,
   "gfx.driver-init.appVersion": "42.0",
   "gfx.driver-init.feature-d2d": true,
   "javascript.enabled": false,
   "media.gmp-eme-adobe.lastUpdate": 1446806843,
   "media.gmp-manager.buildID": "20151029151421",
   "media.gmp-gmpopenh264.lastUpdate": 1446806848,
   "media.gmp-gmpopenh264.version": "1.4",
   "media.gmp-eme-adobe.abi": "x86-msvc",
   "media.hardware-video-decoding.failed": false,
   "media.gmp-eme-adobe.version": "15",
   "media.gmp-gmpopenh264.abi": "x86-msvc",
   "media.gmp-manager.lastCheck": 1446893473,
   "network.cookie.prefsMigrated": true,
   "network.http.proxy.pipelining": true,
   "network.predictor.cleaned-up": true,
   "places.history.expiration.transient_current_max_pages": 84960,
   "places.database.lastMaintenance": 1446837076,
   "plugin.importedState": true,
   "plugin.disable_full_page_plugin_for_types": "application/pdf",
   "privacy.sanitize.migrateFx3Prefs": true,
   "storage.vacuum.last.places.sqlite": 1446837075,
   "storage.vacuum.last.index": 0
 },
 "lockedPreferences": {},
 "graphics": {
   "numTotalWindows": 1,
   "numAcceleratedWindows": 1,
   "windowLayerManagerType": "Direct3D 11",
   "windowLayerManagerRemote": true,
   "supportsHardwareH264": true,
   "adapterDescription": "Intel(R) HD Graphics",
   "adapterVendorID": "0x8086",
   "adapterDeviceID": "0x0102",
   "adapterSubsysID": "04ad1028",
   "adapterRAM": "Unknown",
   "adapterDrivers": "igdumd32 igd10umd32 igd10umd32",
   "driverVersion": "9.17.10.3347",
   "driverDate": "10-31-2013",
   "adapterDescription2": "",
   "adapterVendorID2": "",
   "adapterDeviceID2": "",
   "adapterSubsysID2": "",
   "adapterRAM2": "",
   "adapterDrivers2": "",
   "driverVersion2": "",
   "driverDate2": "",
   "isGPU2Active": false,
   "direct2DEnabled": true,
   "directWriteEnabled": true,
   "directWriteVersion": "6.1.7601.17514",
   "webglRenderer": "Google Inc. -- ANGLE (Intel(R) HD Graphics Direct3D9Ex vs_3_0 ps_3_0)",
   "info": {
     "AzureCanvasBackend": "direct2d",
     "AzureSkiaAccelerated": 0,
     "AzureFallbackCanvasBackend": "cairo",
     "AzureContentBackend": "direct2d"
   }
 },
 "javaScript": {
   "incrementalGCEnabled": true
 },
 "accessibility": {
   "isActive": false,
   "forceDisabled": 0
 },
 "libraryVersions": {
   "NSPR": {
     "minVersion": "4.10.10",
     "version": "4.10.10"
   },
   "NSS": {
     "minVersion": "3.19.4 Basic ECC",
     "version": "3.19.4 Basic ECC"
   },
   "NSSUTIL": {
     "minVersion": "3.19.4",
     "version": "3.19.4"
   },
   "NSSSSL": {
     "minVersion": "3.19.4 Basic ECC",
     "version": "3.19.4 Basic ECC"
   },
   "NSSSMIME": {
     "minVersion": "3.19.4 Basic ECC",
     "version": "3.19.4 Basic ECC"
   }
 },
 "userJS": {
   "exists": false
 },
 "crashes": {
   "submitted": [],
   "pending": 0
 },
 "extensions": [
   {
     "name": "anonymoX",
     "version": "2.5.2",
     "isActive": true,
     "id": "client@anonymox.net"
   },
   {
     "name": "Avast Online Security",
     "version": "10.2.0.187",
     "isActive": false,
     "id": "wrc@avast.com"
   },
   {
     "name": "Dailymotion Publish it!",
     "version": "1.0.3.2.1-signed",
     "isActive": false,
     "id": "jid1-Mc8icFbaxhJLuQ@jetpack"
   },
   {
     "name": "Elite Proxy Switcher",
     "version": "1.2.0.2.1-signed",
     "isActive": false,
     "id": "eliteproxyswitcher@my-proxy.com"
   },
   {
     "name": "IDM integration",
     "version": "6.23.25",
     "isActive": false,
     "id": "mozilla_cc2@internetdownloadmanager.com"
   },
   {
     "name": "Invite All (for Facebook)",
     "version": "0.2.1-signed",
     "isActive": false,
     "id": "jid0-zs24wecdcQo0Lp18D7QOV4WSZFo@jetpack"
   },
   {
     "name": "Proxy Selector",
     "version": "1.31.1-signed",
     "isActive": false,
     "id": "proxyselector@mozilla.org"
   },
   {
     "name": "Skype Click to Call",
     "version": "7.5.0.9082",
     "isActive": false,
     "id": "{82AF8DCA-6DE9-405D-BD5E-43525BDAD38A}"
   }
 ],
 "experiments": []

}

thanks, this shows that javascript is indeed turned off in your firefox (maybe this is part of the features of the anonymox extension you're using - i don't know). in order to fix this, enter about:config into the firefox address bar (confirm the info message in case it shows up) & search for the preference named javascript.enabled. double-click it and change its value to true.