I tried on new firefox profile and it works! However later (i installed my other addons) it turned back and the problem had continued. I guess you're right, most probably there is a problem from other extensions, let me try to disably one by one. Here is the about:support data
Application Basics
------------------
Name: Firefox
Version: 24.0
User Agent: Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Firefox/24.0
Extensions
----------
Name: Adblock Plus
Version: 2.4
Enabled: true
ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}
Name: DownloadHelper
Version: 4.9.21
Enabled: true
ID: {b9db16a4-6edc-47ec-a1f4-b86292ed211d}
Name: DownThemAll!
Version: 2.0.16
Enabled: true
ID: {DDC359D1-844A-42a7-9AA1-88A850A938A8}
Name: F.B. Purity - Cleans Up Facebook
Version: 8.8.2
Enabled: true
ID:
fbp@fbpurity.comName: Favicon Restorer
Version: 1.4
Enabled: true
ID:
faviconrestorer@masserog.itName: LeechBlock
Version: 0.6.6
Enabled: true
ID: {a95d8332-e4b4-6e7f-98ac-20b733364387}
Name: Private Tab
Version: 0.1.5
Enabled: true
ID: privateTab@infocatcher
Name: Tab Scope
Version: 1.5
Enabled: true
ID:
tabscope@xuldev.orgName: Yet Another Smooth Scrolling
Version: 3.1.7
Enabled: true
ID: yetanothersmoothscrolling@kataho
Important Modified Preferences
------------------------------
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.disk.smart_size_cached_value: 358400
browser.places.smartBookmarksVersion: 4
browser.startup.homepage_override.buildID: 20130910160258
browser.startup.homepage_override.mstone: 24.0
browser.tabs.tabClipWidth: 1
dom.mozApps.used: true
extensions.lastAppVersion: 24.0
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1382191709
places.history.expiration.transient_current_max_pages: 52655
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
privacy.sanitize.migrateFx3Prefs: true
storage.vacuum.last.index: 0
storage.vacuum.last.places.sqlite: 1382191709
Graphics
--------
Adapter Description: Mobile Intel(R) 4 Series Express Chipset Family
Adapter Drivers: igdumdx32 igd10umd32 igd10umd32
Adapter RAM: Unknown
Device ID: 0x2a42
Direct2D Enabled: Blocked for your graphics driver version. Try updating your graphics driver to version 8.1500.1000.2202 or newer.
DirectWrite Enabled: false (6.2.9200.16571)
Driver Date: 7-3-2009
Driver Version: 8.15.10.1840
GPU #2 Active: false
GPU Accelerated Windows: 0/1 Basic Blocked for your graphics driver version. Try updating your graphics driver to version 8.1500.1000.1855 or newer.
Vendor ID: 0x8086
WebGL Renderer: Blocked for your graphics driver version. Try updating your graphics driver to version 8.1500.1000.1855 or newer.
windowLayerManagerRemote: false
AzureCanvasBackend: skia
AzureContentBackend: none
AzureFallbackCanvasBackend: cairo
JavaScript
----------
Incremental GC: true
Accessibility
-------------
Activated: false
Prevent Accessibility: 0
Library Versions
----------------
NSPR
Expected minimum version: 4.10
Version in use: 4.10
NSS
Expected minimum version: 3.15.1 Basic ECC
Version in use: 3.15.1 Basic ECC
NSSSMIME
Expected minimum version: 3.15.1 Basic ECC
Version in use: 3.15.1 Basic ECC
NSSSSL
Expected minimum version: 3.15.1 Basic ECC
Version in use: 3.15.1 Basic ECC
NSSUTIL
Expected minimum version: 3.15.1
Version in use: 3.15.1
here is the error/browser console
[20:34:42.050] [Private Tab] 34:42:050 keydown: matched key: openNewPrivateTab, phase: CAPTURING_PHASE
[20:34:42.050] [Private Tab] 34:42:050 handleCommand: openNewPrivateTab
[20:34:42.050] [Private Tab] 34:42:050 waitForTab()
[20:34:42.058] [Private Tab] 34:42:058 waitForTab(): nothing
[20:34:42.070] [Private Tab] 34:42:070 swapDocShells(): usePrivateBrowsing: false
[20:34:42.077] Only internal code is allowed to set the usePrivateBrowsing attribute @
resource://gre/modules/XPIProvider.jsm -> jar:file:///C:/Users/omer.coskun/AppData/Roaming/Mozilla/Firefox/Profiles/qxgxzaqx.default-1382186046824/extensions/privateTab@infocatcher.xpi!/bootstrap.js:667
[20:34:42.077] [Private Tab] 34:42:077 swapDocShells(): set usePrivateBrowsing to false
[20:34:42.078] [Private Tab] 34:42:078 Tab opened: New Tab
Inherit private state: undefined
thanks for help. I will try to disable the extensions one by one.