In last 2 days, firefox will not open with Onspeed enabled

In last 2 days Firefox 3.6.6 reports that it cannot find its server, when I have Onspeed enabled. If I disable Onspeed, no problem. I have not messed with either recently. I use Windows Vista and have Adobe and Java plugins installed.
== This happened ==
Every time Firefox opened
== I tried to start Firefox 2 days ago.

After reading several posts in the Support Forum I tried a solution. I deleted the "sessionstore-backups" folder.
Please try this: click the menu button ≡ and then click help ? > troubleshooting information > profile folder - "show folder". Then a new window will open up. In this window look out for a folder named "sessionstore-backups", delete this folder and restart firefox afterwards.
The problem was resolved.

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@glennhaste, the public pages I visited seem identical in IE8 and Fx10, but you may be referring to a part of the site that requires logging in (impossible for non-customers to view).
Since the problem is so recent, can you recall any changes you made in Firefox, or are you aware of any changes your CU made on its site?
When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.
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2. If needed, delete the site's cookies here
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Firefox will not open with my previous session

[I am posting this question using IE.]
Last night when I quit Firefox I closed the browser without noticing an ad in a new browser window had opened. Thus, my last browser open was the ad page.
So when I open the browser now, it tells me "Firefox is having trouble recovering your windows and tabs. This is usually caused by a recently opened web page." The only option is to restore "Advertisement".
I have done a complete search on my computer. The only other sessionstore files (sessionstore-nn.js) are located in a differently named profile folder dating back to May, 2012.
In my current profile folder I have sessionstore.js and sessionstore.bak.
The sessionstore.js file represents Firefox opening with NO old tabs; it is 1 KB in size.
The sessionstore.bak file represents my "last" browsing session; it is 11,952 KB.
I close Firefox (Mozilla home page) by clicking on File, Exit.
In the Profile folder I rename sessionstore.js (1 KB) to sessionstore.js.bak. In other attempts I have rename it sessionstore.tmp, sessionstore.old, etc.
I then rename sessionstore.bak (11,952 KB) to sessionstore.js.
When I restart Firefox (V 24.0) I get the same error message, "Firefox is having trouble recovering your windows and tabs. This is usually caused by a recently opened web page." The only option is to restore "Advertisement".
Restore Previous Session is grayed out; there is no button on the home page to restore a previous session.
So, is the sessionstore.bak (11,952 KB) *really* just the advertising page? If so, where is the sessionstore file that contains my actual previous browsing session? (More tabs that you can imagine.)
What should I try next to get Firefox to open with my "lost" browsing session?

When I click on Tools - Options - Privacy, Firefox will Remember History.
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There i* a line below History which states: 'You may want to *clear your recent history* or *remove individual cookies*'. The text enclosed within the asterisks indicates a link.
I have not clicked on 'clear your recent history'. Please see the attached image.

Firefox will not open with previous session. Option automatically resets to default.

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Troubleshoot report:
Application Basics
Name: Firefox
Version: 36.0
User Agent: Mozilla/5.0 (Windows NT 6.0; rv:36.0) Gecko/20100101 Firefox/36.0
Multiprocess Windows: 0/1
Crash Reports for the Last 3 Days
Report ID: bp-fb4e0890-4a04-4323-ab6d-9b0ef2150304
Submitted: 19 hours ago
All Crash Reports
Extensions
Name: Google Translator for Firefox
Version: 2.1.0.3m
Enabled: true
ID: [email protected]
Name: Norton Toolbar
Version: 2014.7.10.26
Enabled: true
ID: {2D3F3651-74B9-4795-BDEC-6DA2F431CB62}
Name: Microsoft .NET Framework Assistant
Version: 0.0.0
Enabled: false
ID: {20a82645-c095-46ed-80e3-08825760534b}
Graphics
Adapter Description: NVIDIA GeForce GTX 260
Adapter Drivers: nvd3dum nvwgf2um,nvwgf2um
Adapter RAM: 896
Device ID: 0x05e2
Direct2D Enabled: true
DirectWrite Enabled: true (7.0.6002.23200)
Driver Date: 7-2-2014
Driver Version: 9.18.13.4052
GPU #2 Active: false
GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC)
Subsys ID: 12603842
Vendor ID: 0x10de
WebGL Renderer: Google Inc. -- ANGLE (NVIDIA GeForce GTX 260 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: 4
browser.places.smartBookmarksVersion: 7
browser.sessionstore.upgradeBackup.latestBuildID: 20150222232811
browser.startup.homepage: http://my.myway.com/index.jsp?speedbarconfigchanged
browser.startup.homepage_override.buildID: 20150222232811
browser.startup.homepage_override.mstone: 36.0
extensions.lastAppVersion: 36.0
gfx.direct3d.last_used_feature_level_idx: 1
media.gmp-gmpopenh264.lastUpdate: 1425537886
media.gmp-gmpopenh264.version: 1.3
media.gmp-manager.lastCheck: 1425537884
network.cookie.prefsMigrated: true
places.history.expiration.transient_current_max_pages: 80469
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: 3.17.4 Basic ECC
Version in use: 3.17.4 Basic ECC
NSSSMIME
Expected minimum version: 3.17.4 Basic ECC
Version in use: 3.17.4 Basic ECC
NSSSSL
Expected minimum version: 3.17.4 Basic ECC
Version in use: 3.17.4 Basic ECC
NSSUTIL
Expected minimum version: 3.17.4
Version in use: 3.17.4
Experimental Features
---------------------

After reading several posts in the Support Forum I tried a solution. I deleted the "sessionstore-backups" folder.
Please try this: click the menu button ≡ and then click help ? > troubleshooting information > profile folder - "show folder". Then a new window will open up. In this window look out for a folder named "sessionstore-backups", delete this folder and restart firefox afterwards.
The problem was resolved.

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After reading several posts in the Support Forum I tried a solution. I deleted the "sessionstore-backups" folder.
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The problem was resolved.

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== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; GTB0.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2; .NET4.0C; Tablet PC 2.0)

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[http://www.imageshack.us ImageShack]
[www.mediafire.com MediaFire]
[www.kimag.es Kimages]
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When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.
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*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
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*Firefox 20.0.x: http://www.mozilla.org/en-US/firefox/all.html
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*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other profile data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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'''Note:''' You might want to print these steps or view them in another browser.
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Please report back soon.

In last 2 days, firefox will not open with Onspeed enabled

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