FF is extremely slow so I tried other browsers and got the speed I'm paying for. I reinstalled a clean FF with no addons and new preferences. ???
Did a clean install of FF and disables nonessential plugins. Still very slw. IE, chrome and safari are very fast but not user friendly
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You could try the suggestion here.
Which security software (firewall, anti-virus) do you have?
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:
You can try to reset Firefox to see if that helps.
Reset creates a new profile and tries to import some settings from the old profile leaving the old profile intact.