Firefox became incredibly slow on every web page

Hi,
My Firefox became really slow on all the web pages for unknown reason since one month ago, while I haven't installed any new features and was working with the web sites I used to use. Since then I've switched off most of the plugins such as Flash Player, as I suspected that they might have caused the slowness. But it didn't make any difference.
Working with Firefox has really become a pain now as it reduced my efficiency from 100 to 0. Basically every action I take with keyboard or touchpad has a delay, even clicking on a tab it takes 10 seconds or so to switch to that tab, and every time when launching Firefox, my laptop's CPU goes straight up and remains at 100%. Besides it crashed frequently, or pages became wholy black after some time, which forced me to restart many times a day, even if really few tabs are opened.
I tried to check my plugins through "plugincheck" from Firefox, but it has kept loading there with "Checking with Mozilla on the status of your plugins" for hours without showing anything.
I'm running Windows 7 Service Pack 1 with 3 GB of RAM, and more than half of hard drive space remain free. I also have Google Chrome on my laptop but I still prefer Firefox, if this issue can be solved!
Thanks for any help! :-)

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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