It's quite possible, considering what you're experiencing, NovaMan. I see many instances wherein FireFox just stutters, even when it's not downloading anything other than web page elements. Almost like it freezes. I would turn off plugins, as LONSat suggests. Another thing to try is uninstalling FFox, deleting it's folder from C://Users/yourname/AppData/Roaming/Mozilla/Firefox, too. Because just uninstalling leaves all your settings. To SAVE your settings first, to for example keep just your Bookmarks, use MozBackup (MozBackup - Backup tool for Firefox and Thunderbird
), a free tool, that also backs up and restores Thunderbird files.