Google and Facebook show 'This connection is untrusted'; other sites are fine. What's wrong?

Hi there,
Yesterday I could log into sites like Facebook, Google and others fine, and now when I try to log in to them it comes up with the following message:
'This connection is untrusted.
www.facebook.com uses an invalid security certificate.
The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer)'
I managed to get onto other sites like BBC News and Outlook without any error messages. Strangely, Google Images comes up fine from a bookmarked link, but then goes to untrusted as soon as you search for anything. I've seen this message come up on the support site before, and have tried the following suggestions:
-Cleared the cache
-Cleared cookies (including individual page cookies)
-Deleted internet temp files
-Cleared Downloads folder in Firefox
-Opened Firefox in Safe Mode to rule out add-on problems
-Chosen 'No proxy server' in the Network options
-Reloaded the page using Ctrl-Shift-R
-Reloaded the page from a History tab when it was working (yesterday)
-Used the bookmarked link
-Typed the link in directly
-Reset Firefox
-Deleted the 'cert8' file in the Firefox folder
-Synchronised system time and date with time.windows
-Full antivirus scan on computer (which showed nothing)
-Checked web security settings in Bullguard (no interference there)
-Uninstalled/reinstalled Firefox
I managed to get Google working eventually, then the Mozilla Support pages said they were untrusted, so I'm currently posting from Chrome, which is becoming my backup browser more frequently :(
Apologies for the lack of proper Troubleshooting info! Here's the best I can do:
Application Basics
Name: Firefox
Version: 27.0.1
User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0
Crash Reports for the Last 3 Days
All Crash Reports
Extensions
Name: BullGuard Safe Browsing
Version: 2.1
Enabled: true
ID: antiphishing@bullguard
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_override.buildID: 20140212131424
browser.startup.homepage_override.mstone: 27.0.1
dom.mozApps.used: true
extensions.lastAppVersion: 27.0.1
gfx.direct3d.last_used_feature_level_idx: 0
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1394963403
places.history.expiration.transient_current_max_pages: 104858
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
privacy.sanitize.migrateFx3Prefs: true
Graphics
Adapter Description: Intel(R) HD Graphics 4000
Adapter Drivers: igdumdim64 igd10iumd64 igd10iumd64 igdumdim32 igd10iumd32 igd10iumd32
Adapter RAM: Unknown
Device ID: 0x0166
Direct2D Enabled: true
DirectWrite Enabled: true (6.3.9600.16384)
Driver Date: 10-1-2013
Driver Version: 10.18.10.3316
GPU #2 Active: false
GPU Accelerated Windows: 1/1 Direct3D 10
Vendor ID: 0x8086
WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4000 Direct3D9Ex vs_3_0 ps_3_0)
windowLayerManagerRemote: false
AzureCanvasBackend: direct2d
AzureContentBackend: direct2d
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
OS: Windows 8.1 x64
Any idea what else I can try? Facebook I'm not too worried about, but I need Google for work and pretty much everything else!
EDIT: I gave up, went and had a pint of tea and when I came back everything seemed to be alright again! Not sure what the hell happened. Does anyone else have any idea why this comes up, or is it just something that happens now and again?

this is similar to your question.just go-through it or if you stuck then reply back for more info on this problem : https://support.mozilla.org/en-US/questions/974711

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