I've had a strange issue that may have been caused by upgrading to Noscript 5.1.6. I closed my Firefox earlier today and shortly afterwards re-opened it, with the notification that Noscript had updated. However I found that many other websites had become inaccessible. Paypal.com brought up a screen with a message like "found, return to gb/home", www.bbc.co.uk gave a "301 moved permanently" message, and many other websites only opened as blank pages. Closing and re-opening the browser several times did not fix the problem. My first suspicion was that Noscript's update had caused an issue, so I disabled it, which fixed the issue immediately. After re-enabling it there was still no problem.
In retrospect the URLs I was using were missing the "HTTPS" prefix that is automatically added (my link to "www.bbc.co.uk" ordinarily sends me to "https://www.bbc.co.uk/", "paypal.com" to "https://www.paypal.com/gb/home", etc), which makes me wonder if there was an issue with redirects.
Oddly, one website that loaded fine when all others I tried failed - https://www.redlettermedia.com/ - now returns a "Secure Connection Failed" message - "SSL received a record that exceeded the maximum permissible length." Notably, this also happens when I try and access it on my phone, outside of my home network.
I've run a scan with MBAM for good measure, which turned up nothing. The problem appears to be fixed apart from that one website; can anyone shed some light as to what may have happened and whether I need to be concerned? Is it possible that an issue with the redlettermedia.com website may have affected my computer?