Help. Firefox quit being able to connect with the internet. Other browsers can. Did a full reinstallation - no help. Windows 7

I have used firefox for years on Windows 7. I had an intermittent problem where firefox dropped the internet connection (unable to locate server) fixed by resetting the router.
Today, resetting the router did not work. I tried Internet Explorer - worked fine.
Booted and reinstalled firefox - same thing.
Did a wipeout reinstall - now nothing. You enter a url -nothing.
Help. I need my firefox.

That issue can be caused by corrupted cookies.
*https://support.mozilla.org/kb/Cannot+log+in+to+websites
Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
*Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
"Remove Cookies" from sites causing problems:
*Tools > Options > Privacy > Cookies: "Show Cookies"
If clearing the cookies doesn't help then it is possible that the file <i>cookies.sqlite</i> that stores the cookies is corrupted.<br />
Rename (or delete) <b>cookies.sqlite</b> (cookies.sqlite.old) and delete other present cookie files like <b>cookies.sqlite-journal</b> in the Firefox Profile Folder in case the file cookies.sqlite got corrupted.
*http://kb.mozillazine.org/Cookies

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