Does Firefox eventually give you a message, for example, the server was not found or the connection timed out?

Does the mobile page load? That's: https://m.facebook.com/

You can double-check your Firefox connection settings here:

• Windows: "3-bar" menu button (or Tools menu) > Options
• Mac: "3-bar" menu button (or Firefox menu) > Preferences
• Linux: "3-bar" menu button (or Edit menu) > Preferences
• Any system: type or paste about:preferences into the address bar and press Enter/Return to load it

In the search box at the top of the page, type proxy and Firefox should filter to the "Settings" button, which you can click.

The default of "Use system proxy settings" piggybacks on your Windows/IE "LAN" setting. "Auto-detect" can lead to a flaky connection. You may want to try "No proxy".

Any difference?

proxy set to no proxy browser will not load facebook bookmark i have to type https://www.facebook.com manually in search bar and then it just sets a dot going back and forth in tab and times out

i have uninstalled everything including the app data files and done a registry scan to get rid of leftovers then reinstalled firefox and still it wont open facebook i hasve even reinstalled windows 10!

Firefox itself doesn't treat Facebook specially, and you removed all your add-ons when you used Refresh (unless some have reappeared), so I don't have a guess as to why the connection is timing out unless there is an external factor at work, such as "parental control" or other filtering software. ??

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