Since no one was giving any background information there is no real way anyone can help with this problem. And is up to the user themselves to leave or use firefox.

squonk said

I updated FF and can't view all of my Facebook pages because I need to activate Javascript but FF doesn't allow it, making FB useless on Firefox.

John, in Firefox JavaScript is enabled by default ....

You can check to see if maybe for some weird reason it has been disabled :

Type in the address bar about:config and press Enter (promise to be careful, if asked)

Type in the search bar javascript.enabled

Make sure its value is set to true

You can try these steps in case of issues with web pages : Reload the page : Hold down the Shift key and left-click the Reload button or press 'Ctrl + F5' or press 'Ctrl + Shift + R'

Another thing to try :

Clear the Firefox cache :

https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

"Remove the cookies" from websites that cause problems :

https://support.mozilla.org/en-US/kb/delete-cookies-remove-info-websites-stored (scroll down to : "Delete cookies for a single site")

McCoy, I've tried all your suggestions, still doesn't give a full page as I get in Chrome (see attachment). Javascript shows as enabled in about:config but I get that error on pages in FB I go to...

JS is enabled as I said, no change.

John

If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block (wanted) content (Adblock Plus, NoScript, Disconnect, Ghostery, Privacy Badger, uBlock Origin) always make sure such extensions do not block (wanted) content.

• make sure your extensions and filters are updated to the latest version
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Firefox shows the shield icon at the left end of the location/address bar in case Content Blocking is blocking content.

• click the shield icon for more detail and possibly disable the protection

You can check the Web Console about what content is blocked

• "3-bar" menu button or Tools -> Web Developer
• https://support.mozilla.org/en-US/kb/tracking-protection
• https://support.mozilla.org/en-US/kb/content-blocking

Thanks, cor-el. NoScript was blocking Facebook. Ghostery appears to be OK. Should have checked that when I installed it. All appears to be working now...

John