When you open a new blank tab (Ctrl+t) with browser.newtab.url set to the default of about:newtab, you get an error that the address is not valid?

If you manually type about:newtab in the address bar and press Enter, will it load?

By the way, why do you crash Firefox to end your sessions?

I have tried all combinations under the options/general start setting cntl-t ,,about:newtab,,have set the home page to various sites including default when clicking on live link in other apps like tbird opens fine I am running on an antique XP MSI/celeron pc after my w7 laptop died I try to keep the number of tabs under 7 because fx is such a mem hog only have 512k to work with and have assigned the page file to the fastest drive that i have and 20 gig dedicated. Even so the pc slows way down when fx takes up more than 300meg of page file. just because you close a tab doesnt mean fx releases the mem When i crash fx the page file usually drops from around 1gig to about 160meg depending on what else i am doing when i reopen fx the restore page come up and i reload the tabs i need , the page file is around 800meg, I even play with the priority settings depending on what i am doing

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

See "Creating a profile":

• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer some files from an existing profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over the problem

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

Do a malware check with several malware scanning programs on the Windows computer.
Please scan with all programs because each program detects different malware.
All these programs have free versions.

Make sure that you update each program to get the latest version of their databases before doing a scan.

• Malwarebytes' Anti-Malware:
  http://www.malwarebytes.org/mbam.php
• AdwCleaner:
  http://www.bleepingcomputer.com/download/adwcleaner/
  http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
• SuperAntispyware:
  http://www.superantispyware.com/
• Microsoft Safety Scanner:
  http://www.microsoft.com/security/scanner/en-us/default.aspx
• Windows Defender: Home Page:
  http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
• Spybot Search & Destroy:
  http://www.safer-networking.org/en/index.html
• Kasperky Free Security Scan:
  http://www.kaspersky.com/security-scan

You can also do a check for a rootkit infection with TDSSKiller.

• Anti-rootkit utility TDSSKiller:
  http://support.kaspersky.com/5350?el=88446

See also:

• "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

no it just clears the address bar leaving the same The address isn't valid page

ran kaspersky,,it found no malware problems and already running ms security essentials and anti mall stuff as i stated b4 I tried ALL of the previous thread solutions and none worked

could you go to firefox > 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...

Application Basics
------------------
Name: Firefox
Version: 27.0.1
User Agent: Mozilla/5.0 (Windows NT 5.1; rv:27.0) Gecko/20100101 Firefox/27.0
Crash Reports for the Last 3 Days
---------------------------------
All Crash Reports
Extensions
----------
Name: Adblock Plus
Version: 2.4.1
Enabled: true
ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}
Name: Fasterfox
Version: 3.9.85
Enabled: true
ID: {c36177c0-224a-11da-8cd6-0800200c9a91}
Name: NoSquint
Version: 2.1.9
Enabled: true
ID: nosquint@urandom.ca
Name: Self-Destructing Cookies
Version: 0.4.3
Enabled: true
ID: jid0-9XfBwUWnvPx4wWsfBWMCm4Jj69E@jetpack
Name: Widevine Media Optimizer
Version: 6.0.0.12442
Enabled: true
ID: {2d3fbcf7-be69-4433-8858-c621a8d0e58d}
Name: Skype Click to Call
Version: 6.13.0.13771
Enabled: false
ID: {82AF8DCA-6DE9-405D-BD5E-43525BDAD38A}
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.sessionstore.upgradeBackup.latestBuildID: 20140212131424
browser.startup.homepage: about:home
browser.startup.homepage_override.buildID: 20140212131424
browser.startup.homepage_override.mstone: 27.0.1
browser.tabs.loadInBackground: false
browser.zoom.siteSpecific: false
dom.mozApps.used: true
extensions.lastAppVersion: 27.0.1
gfx.blacklist.direct2d: 3
gfx.blacklist.layers.direct3d10: 3
gfx.blacklist.layers.direct3d10-1: 3
gfx.blacklist.layers.direct3d9: 3
gfx.blacklist.layers.opengl: 3
gfx.blacklist.stagefright: 3
gfx.blacklist.suggested-driver-version: 6.1400.1000.5218
gfx.blacklist.webgl.angle: 3
gfx.blacklist.webgl.msaa: 3
gfx.blacklist.webgl.opengl: 3
mousewheel.withcontrolkey.action: 3
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1392694884
places.history.expiration.transient_current_max_pages: 13199
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
print.printer_Brother_HL-2070N_series.print_bgcolor: false
print.printer_Brother_HL-2070N_series.print_bgimages: false
print.printer_Brother_HL-2070N_series.print_colorspace:
print.printer_Brother_HL-2070N_series.print_command:
print.printer_Brother_HL-2070N_series.print_downloadfonts: false
print.printer_Brother_HL-2070N_series.print_duplex: 4784211
print.printer_Brother_HL-2070N_series.print_edge_bottom: 0
print.printer_Brother_HL-2070N_series.print_edge_left: 0
print.printer_Brother_HL-2070N_series.print_edge_right: 0
print.printer_Brother_HL-2070N_series.print_edge_top: 0
print.printer_Brother_HL-2070N_series.print_evenpages: true
print.printer_Brother_HL-2070N_series.print_in_color: true
print.printer_Brother_HL-2070N_series.print_margin_bottom: 0.5
print.printer_Brother_HL-2070N_series.print_margin_left: 0.5
print.printer_Brother_HL-2070N_series.print_margin_right: 0.5
print.printer_Brother_HL-2070N_series.print_margin_top: 0.5
print.printer_Brother_HL-2070N_series.print_oddpages: true
print.printer_Brother_HL-2070N_series.print_orientation: 0
print.printer_Brother_HL-2070N_series.print_page_delay: 50
print.printer_Brother_HL-2070N_series.print_paper_data: 1
print.printer_Brother_HL-2070N_series.print_paper_height: 11.00
print.printer_Brother_HL-2070N_series.print_paper_name:
print.printer_Brother_HL-2070N_series.print_paper_size_type: 0
print.printer_Brother_HL-2070N_series.print_paper_size_unit: 0
print.printer_Brother_HL-2070N_series.print_paper_width: 8.50
print.printer_Brother_HL-2070N_series.print_plex_name:
print.printer_Brother_HL-2070N_series.print_resolution: 7929975
print.printer_Brother_HL-2070N_series.print_resolution_name:
print.printer_Brother_HL-2070N_series.print_reversed: false
print.printer_Brother_HL-2070N_series.print_scaling: 1.00
print.printer_Brother_HL-2070N_series.print_shrink_to_fit: true
print.printer_Brother_HL-2070N_series.print_to_file: false
print.printer_Brother_HL-2070N_series.print_unwriteable_margin_bottom: 0
print.printer_Brother_HL-2070N_series.print_unwriteable_margin_left: 0
print.printer_Brother_HL-2070N_series.print_unwriteable_margin_right: 0
print.printer_Brother_HL-2070N_series.print_unwriteable_margin_top: 0
privacy.donottrackheader.enabled: true
privacy.sanitize.migrateFx3Prefs: true
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1392044294
Graphics
--------
Adapter Description: Intel(R) 82845G/GL/GE/PE/GV Graphics Controller
Adapter Drivers: ialmrnt5
Adapter RAM: Unknown
Device ID: 0x2562
Direct2D Enabled: Blocked for your graphics driver version. Try updating your graphics driver to version 6.1400.1000.5218 or newer.
DirectWrite Enabled: false (0.0.0.0)
Driver Date: 11-2-2004
Driver Version: 6.14.10.3943
GPU #2 Active: false
GPU Accelerated Windows: 0/1 Basic Blocked for your graphics driver version. Try updating your graphics driver to version 6.1400.1000.5218 or newer.
Vendor ID: 0x8086
WebGL Renderer: Blocked for your graphics driver version. Try updating your graphics driver to version 6.1400.1000.5218 or newer.
windowLayerManagerRemote: false
AzureCanvasBackend: skia
AzureContentBackend: cairo
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0
JavaScript
----------
Incremental GC: true
Accessibility
-------------
Activated: false
Prevent Accessibility: 0
Library Versions
----------------
NSPR
Expected minimum version: 4.10.2
Version in use: 4.10.2
NSS
Expected minimum version: 3.15.4 Basic ECC
Version in use: 3.15.4 Basic ECC
NSSSMIME
Expected minimum version: 3.15.4 Basic ECC
Version in use: 3.15.4 Basic ECC
NSSSSL
Expected minimum version: 3.15.4 Basic ECC
Version in use: 3.15.4 Basic ECC
NSSUTIL
Expected minimum version: 3.15.4
Version in use: 3.15.4

and does this also happen when you launch firefox in safemode once for testing purposes?

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

it has been a few days ,, but i believe so,, I think this all started after fx updated from 26 to 27

Does changing the newtaburl argument in about:config change at all if you put in any of these, let's just check the functionality: (3) Double-click the browser.newtab.url preference and enter the desired value:

(i) Page thumbnails (default)

about:newtab (no as you said)

(ii) Blank tab

about:blank

(iii) Built-in Firefox home page

about:home

(iv) Any other page

full URL to the page

Press Ctrl+t to open a new tab and verify that it worked. Fixed?

AH-HA by modifying browser.newtab.url was able to finally get it to go to about:blank and 2wire.com THEN CLOSING THE TAB I CHANGED IT IN but that change is NOT carried back to the options/general/startup settings.. nor is any change to the options/general/startup settings carried to about:config..is this an internal file to fx? would still like to know what the full url string to the fx page that puts up the thumbnails for recent I dont think this problem showed until the upgrade from 26 to 27

Hi smurfxyz, the home page and new tab page are independent settings. Usually the home page is used when you create a new window (Ctrl+n) and the new tab page is used when you create a new tab in an existing window (Ctrl+t).

With that in mind, could you clarify: the problem is with your home page setting only?

Hi smurfxyz, the internal address of the new tab page is about:newtab. In my original reply I asked what happened if you typed about:newtab in the address bar and pressed Enter. I can't tell from your response whether you tried that.

Some users have become accustomed to use an extension that creates a similar display and has a name such as Speed Dial or Fast Dial (there are many of these). If you previously had tiles on your home page in a new window, perhaps you were using an extension before?

by modifying browser.newtab.url was able to finally get it to go to about:blank and www.2wire.com works to

that change is NOT carried back to the options/general/startup settings.. nor is any change to the options/general/startup settings carried to about:config.. when you make a change they should be written somewhere

changing to about:newtab doesnt work

Hi smurfxyz, that's what I mean about the separate settings.

• browser.newtab.url is for new tabs (Ctrl+t) and there is no box for it in Options

• browser.startup.homepage is for the first tab(s) in a new window (Ctrl+n), and is set in the Options dialog on the General panel

What is set as your home page now?

for months when opening a new tab it went to a page that displayed 9-12 thumbnails of recent sites i had been to very useful. what is that complete url? is there a list of about:items

when opening a new tab fx seems to follow what is in about:config,,not the settings put in the options

now another prob has developed.. 100+ times a day i pop open new fx tabs from links in tbird emails(job links,,etc.) that no longer works and i have to manually copy the ink into a blank tab even restarted fx and tbird---nofix that also goes for the links in your emails from this thread since i havent done anything in tbird suspect i did something in fx

(1) Firefox only has one built-in page which shows your recent sites, which is the about:newtab page I mentioned before. When you type or paste about:newtab in the address bar and press Enter, do you get an error that the address is invalid?

(2) On the external link problem, what happens when you click it?

• Error message (what is the text of the message?)
• Firefox opens to home page, not the requested page
• Long delay before Firefox opens the page
• Firefox never opens any page

humm when opening a new tab (not window) b4 it opened to thumbs that was b4 upgrade from 26 to 27,,are you saying it shouldnt have been doing that..

when i use a link now nothing happens,,i have to rgt-clk copy link switch to fx open a new tab and paste link,,even rgt-clk open in browser doesnt work..

Hi smurfxyz, I need you to try the steps I list and report back on what happens.

When you type or paste about:newtab in the address bar and press Enter, do you get thumbnails, or do you get an error, or do you get diverted to something else?

If that works, and that is the page you want, try putting about:newtab in the places I mentioned before and see whether Ctrl+t works normally again.

I get the addr error message checked browser.startup.homepage was set to about:home changed to about:newtab new instance fx addr error change to http://www.2wire.com new instance opens 2 wire and already opened about:config registers 2wire as startup.homepage noticed that optons/advance/general default browser setting is checked but grayed out went to contr panel add/rem prog/access options/custom fx set as default