FF 27.0.1 very slow download/resolving clicked links/resolve reloads. Computer slows to a halt. New Win7.

Firefox has been running extraordinarily slow. Pages takes sometimes minutes (really) to download/resolve; clicking on links on a page takes many seconds, up to a minute, to register, then the click takes more time to resolve. Autoreloading pages take many minutes to resolve. While all this is going on, the computer slows down, and typing will slow to an almost halt. Characters take many seconds to show up, selected text takes many seconds to register, etc. This is a new computer, 12G of RAM, lots of hard drive. My bf is currently sharing this computer and uses IE. I'm now filling in this form on IE because FF was so painfully slow. And, btw, I don't have a large number of tabs open. About 15 right now.
I took one suggestion from a FF support page and revised my upon-opening to restore all last pages/tabs. I then closed and reopened FF. It is better, but IE has been open at least as long, has many, many more tabs open, and is using a ridiculous amount of memory per tab/groups of tabs, and it is lightning fast. I used to use IE, switched to FF about 2 years ago when IE became too unstable...but I am very seriously considering switching back to IE if FF continues to slow down so drastically and so quickly. And continues to crash without warning. Please don't suggest opening in safe mode....not going to happen. Apparently, from what I can read on your site and other places, FF has become another bloated program that becomes useless after a short time - many, many complaints of very slow loading, etc. Can you please fix this, please.

It is possible that your security software (firewall, anti-virus) 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
*https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating

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