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Just updated Firefox on my laptop. Now it fails.
Latest version of Firefox won’t connect to any websites. Rebooting doesn’t help.
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I have the same issue. Rught after I did a manual update, Firefox wouldn’t load any web pages at all. I launched Internet Explorer (which I haven’t accessed in months)and it wouldn’t load pages either. Suggested fixes I’ve seen require being able to access websites—a Catch22.
It is possible that your firewall or other security software blocks or restricts Firefox without informing you, possibly after detecting changes (update) to the Firefox application. Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access for Firefox and the plugin-container process and the updater process.
Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems.