My Facebook has lost its CSS, it seems. The homepage - and all others - are now lists of subsections in Times down the left side of the screen.
Similarly, on sites where Facebook has a Link, or Like, box such as on newspaper site, the contents of the box are in plain Times with no formatting.
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- If you use extensions like Adblock Plus or NoScript or Flashblock that can block content then make sure that such extensions aren't blocking content.
You can see the installed Firefox extensions in "Tools > Add-ons > Extensions".
See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems
"Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
"Remove the Cookies" from sites that cause problems: Tools > Options > Privacy > Cookies: "Show Cookies"
Thanks for the quick reply. Unfortunately none of those ideas have worked (I had tried clearing cookies previously).