Every Web site I try to go to (such as Facebook, Twitter, etc. which are safe) says that site is dangerous and that I must accept the certificate).

Yesterday my Firefox seemed to spasm and I think I got a virus (whenever I hit the 'home' button which is google.com for me, send me to this weird website I knew wasn't sure). I uninstalled and reinstalled Firefox and ran the virus scanners, but nothing was found. After restarting Firefox, every Web site I try to go to gives me a dangerous error and I have to give each site a security exception, even for safe sites like Facebook, Twitter, etc.. Once I got on Facebook, everything is in HTML format and I can't use it at all, I tried Firefox reboot/uninstall/reactivate once again, but nothing helped. I checked my firewall and nothing came. Here is the data according to the troubleshooting information.

Application Basics
------------------

Name: Firefox
Version: 34.0
User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0
Multiprocess Windows: 0/1

Crash Reports for the Last 3 Days
---------------------------------

All Crash Reports (including 3 pending crashes in the given time range)

Extensions
----------

Name: avast! Online Security
Version: 9.0.2021.112
Enabled: false
ID: [email protected]

Graphics
--------

Adapter Description: Intel(R) HD Graphics 4600
Adapter Description (GPU #2): NVIDIA GeForce GT 755M
Adapter Drivers: igdumdim64 igd10iumd64 igd10iumd64 igdumdim32 igd10iumd32 igd10iumd32
Adapter Drivers (GPU #2): nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Adapter RAM: Unknown
Adapter RAM (GPU #2): 2048
Device ID: 0x0416
Device ID (GPU #2): 0x0fcd
Direct2D Enabled: true
DirectWrite Enabled: true (6.3.9600.17111)
Driver Date: 8-19-2013
Driver Date (GPU #2): 10-4-2013
Driver Version: 10.18.10.3277
Driver Version (GPU #2): 9.18.13.2745
GPU #2 Active: false
GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC)
Subsys ID: 380117aa
Subsys ID (GPU #2): 380117aa
Vendor ID: 0x8086
Vendor ID (GPU #2): 0x10de
WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4600 Direct3D9Ex vs_3_0 ps_3_0)
windowLayerManagerRemote: true
AzureCanvasBackend: direct2d
AzureContentBackend: direct2d
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0

Important Modified Preferences
------------------------------

browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.frecency_experiment: 3
browser.places.smartBookmarksVersion: 7
browser.sessionstore.upgradeBackup.latestBuildID: 20141120192249
browser.startup.homepage_override.buildID: 20141120192249
browser.startup.homepage_override.mstone: 34.0
dom.mozApps.used: true
extensions.lastAppVersion: 34.0
gfx.direct3d.last_used_feature_level_idx: 0
media.gmp-manager.lastCheck: 1417643038
network.cookie.prefsMigrated: true
places.history.expiration.transient_current_max_pages: 104858
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
privacy.sanitize.migrateFx3Prefs: true

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
---------------------

I hope you can understand something I like Firefox, but it's very frustrating that I can't use it and that it happens. I also use Avast! Anti-SECURITE but I'm fairly certain that has no effect on this problem. As I said I also ran malware and virus scanners but nothing came harmful.

Hello

Try to disable the Avast web shield and try to go on some safe sites where you met the "untrusted connection". You can also follow this link for the other common troubleshooting steps: error "this connection is untrusted" message - what to do.

You can try these free programs to search for malicious software that work with your existing anti-virus software:

MalwareBytes' Anti-Malware
AdwCleaner (for more information, see this other AdwCleaner download page)
Microsoft safety scanner
Anti-Rootkit utility - TDSSKiller
Hitman Pro
ESET Online Scanner

If your home page has been changed, and you do not have the suspicious extensions:

Tools (or

) > Addons > Extensions

You can use the Search to reset tool to reset your home page, the new tab page and search bar default back. The extension to uninstall then once that these preferences are reset.

Let us know if that helps.

Tags: Firefox

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