same issue for me, Firefox auto updated to 19.0.2, and i can no longer use it to access the internet. Just shows a blank page, if you click on a shortcut it tries for a second, then goes back to the blank page.

Can open local documents fine, but will not go to online urls.

Its as if it is stuck in work offline mode, but the work offline option is not showing as selected.

All other browsers are OK so its not internet connectivity issues.

As above, never had an issue with firefox before this version.

extra info

this is on Win 7 Pro.

Have disabled all firefox add ons and tried in safe mode, same issue.

i really don't understand, in 18 versions of firefox, this issues never happen until now

I'm using FF 19.0 and FF wil not start sometimes. I never get a message about not being able to connect to the server. A blank screen doesn't even coe up.

I ticked "no proxy", and that didn't help at all. This started about a week ago. I have to shut down the computer (Ubuntu 12.04), wait about 30 seconds, then boot it. Sometimes this works, sometimes, I shut it down, and start it all over.

HELP!

More info - My issue was found on my work pc, came home tonight and my home pc (windows 8) updated to 19.0.2 successfully - does not have the same issue.

normally such issues are caused by firewalls/security software which doesn't recognize & blocks new firefox versions: Fix problems connecting to websites after updating Firefox

A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.

Remove all rules for Firefox and the plugin-container 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.

See:

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

Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

oh silly me, thanks madperson ! but i dont know why my antivirus program didn't block any version of firefox before.

I've a similar problem.

FF updated this morning.

Single tab won't go anywhere.

Fired up my 'tabbed' save session. None of the tabs will load unless I click on them, and even then some won't load at all. I left it for an hour loading tabs (about 18) while I went out, got back and nothing had loaded even though the loading graphic is swirling around! There also a good second delay in every letter appearing when typing on any webpage. Which makes entering text just painful!

I had none of these problems before today's update?? Now FF is completely unusable...