How to stop Firefox from overwriting my last tab with Mozilla ad

I have Firefox 34.0.5 set up to restore my previous session. The problem is that the last tab of my previous session get overwritten by ads from https://www.mozilla.org/en-US/.

Application Basics
Name: Firefox
Version: 34.0.5
User Agent: Mozilla/5.0 (X11; Linux i686; rv:34.0) Gecko/20100101 Firefox/34.0
Multiprocess Windows: 0/1
Crash Reports for the Last 3 Days
All Crash Reports
Extensions
Name: 1-Click YouTube Video Downloader
Version: 2.3.7
Enabled: true
ID: [email protected]
Name: Adblock Plus
Version: 2.6.6
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ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}
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ID: {DDC359D1-844A-42a7-9AA1-88A850A938A8}
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ID: [email protected]
Name: NewTabURL
Version: 2.2.3
Enabled: true
ID: [email protected]
Name: Reader
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ID: {20068ab2-1901-4140-9f3c-81207d4dacc4}
Name: WOT
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ID: {a0d7ccb3-214d-498b-b4aa-0e8fda9a7bf7}
Name: YouTube Auto Replay
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Enabled: true
ID: [email protected]
Name: Youtube MP3 Podcaster
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Enabled: true
ID: [email protected]
Name: Youtube Video Replay
Version: 32.0
Enabled: true
ID: {e1aaa9f8-4500-47f1-9a0a-b02bd60e4076}
Name: Ubuntu Firefox Modifications
Version: 2.6
Enabled: false
ID: [email protected]
Graphics
Adapter Description: GLXtest process failed (exited with status 1): X error occurred in GLX probe, error_code=1, request_code=156, minor_code=19
GPU Accelerated Windows: 0/1 Basic Blocked for your graphics driver version. Try updating your graphics driver to version <Anything with EXT_texture_from_pixmap support> or newer.
WebGL Renderer: Blocked for your graphics card because of unresolved driver issues.
windowLayerManagerRemote: false
AzureCanvasBackend: cairo
AzureContentBackend: cairo
AzureFallbackCanvasBackend: none
AzureSkiaAccelerated: 0
Important Modified Preferences
accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size_cached_value: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.frecency_experiment: 4
browser.display.background_color: #999999
browser.newtab.url: about:home
browser.places.importBookmarksHTML: false
browser.places.smartBookmarksVersion: 7
browser.sessionstore.upgradeBackup.latestBuildID: 20141126041045
browser.startup.homepage_override.buildID: 20141126041045
browser.startup.homepage_override.mstone: 34.0.5
browser.tabs.onTop: false
browser.urlbar.autocomplete.enabled: false
dom.mozApps.used: true
dom.w3c_touch_events.expose: false
extensions.lastAppVersion: 34.0.5
gfx.blacklist.suggested-driver-version: <Anything with EXT_texture_from_pixmap support>
media.gmp-gmpopenh264.lastUpdate: 1417757313
media.gmp-gmpopenh264.version: 1.1
media.gmp-manager.lastCheck: 1418538366
network.cookie.lifetimePolicy: 2
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1418538370
places.history.expiration.transient_current_max_pages: 102117
places.history.expiration.transient_optimal_database_size: 162005810
places.last_vacuum: 1327812932
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
plugin.state.librhythmbox-itms-detection-plugin: 0
print.tmp.printerfeatures.PostScript/default.can_change_colorspace: false
print.tmp.printerfeatures.PostScript/default.can_change_downloadfonts: false
print.tmp.printerfeatures.PostScript/default.can_change_jobtitle: false
print.tmp.printerfeatures.PostScript/default.can_change_num_copies: true
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print.tmp.printerfeatures.PostScript/default.can_change_printincolor: true
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print.tmp.printerfeatures.PostScript/default.orientation.0.name: portrait
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print.tmp.printerfeatures.PostScript/default.supports_plex_change: false
print.tmp.printerfeatures.PostScript/default.supports_printincolor_change: true
print.tmp.printerfeatures.PostScript/default.supports_resolution_change: false
print.tmp.printerfeatures.PostScript/default.supports_spoolercommand_change: true
privacy.cpd.sessions: false
privacy.sanitize.migrateFx3Prefs: true
security.warn_viewing_mixed: false
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1416553811
Important Locked Preferences
JavaScript
Incremental GC: true
Accessibility
Activated: false
Prevent Accessibility: 0
Library Versions
NSPR
Expected minimum version: 4.10.7
Version in use: 4.10.7
NSS
Expected minimum version: 3.17.2 Basic ECC
Version in use: 3.17.2 Basic ECC
NSSSMIME
Expected minimum version: 3.17.2 Basic ECC
Version in use: 3.17.2 Basic ECC
NSSSSL
Expected minimum version: 3.17.2 Basic ECC
Version in use: 3.17.2 Basic ECC
NSSUTIL
Expected minimum version: 3.17.2
Version in use: 3.17.2
Experimental Features
---------------------

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The issue I am dealing with is that I want Firefox to open all links in a new tab but not to switch to them automatically. I have checked all the settings in the Tools >> Options >> Tab menu and I have them all checked except for the last two. I am on Firefox version 36.0.1 and I have refreshed Firefox several times and have deleted and recreated a new profile. Is there a setting somewhere that I'm missing or are there some settings in the About:Config that can be changed to make this happen?

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What you are describing in your Tab Options is correct for the built-in feature. Some sites that use scripts instead of normal links might not be handled correctly, so if this is site-specific, we could look at the site and give you suggestions for workarounds.
I think you will need an add-on to handle other links. Hopefully one of the ones in the earlier post will help: https://support.mozilla.org/questions/1052093#answer-704101

How to stop firefox from opening new ad tabs when clicking on a legit link or even a blank space?

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Do a malware check with several malware scanning programs on the Windows computer.
Please scan with all programs because each program detects different malware.
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*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
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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
*https://support.mozilla.org/kb/troubleshoot-firefox-issues-caused-malware

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*http://kb.mozillazine.org/Resetting_preferences

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*http://kb.mozillazine.org/about:config

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What is the exact error you are receiving? This will help us diagnose the issue in a better way.

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