Firefox cannot load websites when connect/disconnect from any VPN connection

I am consistently uses OpenVPN and RamsesVPN connectivity. But whenever i switch between the VPN connectivity or connect into any VPN or disconnects existing VPN connectivity. My Firefox Browser is unable to load new webpages/Refresh existing open TABS.
In order to restore, i have to restart my Browser each time, whereas i am not facing this problem with Chrome.
I am running with Windows 7 Enterprise edition, and latest Firefox version.
Is there any method to avoid these restarts ?

Hi, this bug is old, but it has useful info for VPNs
See for reference Bug 702111
And there are built in features on the about:config file that you can tweak the number of connections and allowing pipe lining: [http://support.vpnsecure.me/articles/ssh-tunnelling-proxy-troubleshooting/tweaking-firefox-for-best-performance-security Third party information on these connections]
Other suggestions I have seen are to add bookmarks while logged into either vpn. (For example, bookmark the frequent sites you use in either vpn in separate folders)
In Firebug, when you connect or refresh the page when moving from one VPN to the other, do you see a termination in the connection to the first vpn?

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*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

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*https://support.mozilla.org/kb/Server+not+found
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*http://kb.mozillazine.org/Error_loading_websites
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Firefox cannot load websites but other programs can

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Have you already seen [[firefox cannot load websites but other programs can]]
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*What exactly happens, or does not happen and do you get any error messages ?
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Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
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*https://support.mozilla.com/kb/Server+not+found
*https://support.mozilla.com/kb/Firewalls

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All help posted for Firefox cannot load websites but other programs can fail, now what?

I have tried all the things listed but they made no difference at all.
I have no problem with IE. I have been to this site before and it is a bookmarked site.
This problem only came with the last update that never saved any of my search engines either.
Can go to some sites but not others and I have been there before.
Is it time to dump Firefox?
EDIT: One of the sites is speedtest.net, how crap is that?

Big FAIL there as well. I have already tried all that.
I also ran Moz Backup and that failed to help.
I can google speedtest but when I click on the result in the search it times out.
If I try from my bookmarks it also times out.
I have about 80 bookmarks I use all the time
I won't return to Firefox if this is the crap I get after updates.
Not the first time I have had to start from the beginning.
Why do they release this crap if it is not ready for us to use?
I have already tried all the things listed as well as increasing the time out period. That just took longer to tell me it had timed out. RUBBISH

Firefox cannot load websites when connect/disconnect from any VPN connection

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