I kept getting Oops! That page can’t be found.
This had me stumped for weeks, until I found the answer. It is to do with Enhanced Tracking Protection. This stops one tab from seeing information in a different tab. Without this, a tab could peek at the cookies in other tabs,and pass the information to snooping applications.
See What to do if a site seems broken.
- Visit the website.
- At the left of the address bar, click the
shield icon. - At the top right of the panel, toggle off the Enhanced Tracking Protection switch
. The site will be added to your Enhanced Tracking Protection exception list, allowing trackers on it, and the page will reload automatically.
What sites have this enabled?
With Firefox in the URL use about:preferences#privacy . It displays “Trackers follow you around..”. Click on Manage Exceptions, and you can display and specify the web sites that have the Enhanced Tracking Protection turned off.
I have a list including
ColinPaice 