Two days ago, LW started behaving very oddly. It suddenly stopped rendering pages - but only on some sites. For example, the default Lemmy skin is fine but the Alexandrite skin is not. The BBC website doesn't work either. A few others seemingly totally random.
The domain resolves and it makes the initial connection and then it takes up to a minute of doing nothing and then just craps out, unable to render the page. Checking the Inspector reveals no errors or warnings and the network inspector is making a connection but not loading anything other than headers and basic tags.
The page presents no errors it just shows a blank screen. <html> <head>
and <body>
tags load but nothing else.
All these pages work fine in all other browsers I've tested in (floorp, Mullvad, vanilla FFox and Brave).
Details: LibreWolf 128.0-2 (flatpak) on LMDE (Faye).
Any clues, pointers or advice very gratefully received. I love the browser and have it set up just how I like it so don't really want to switch to another.