I'm having a browser-specific problem that I haven't been able to solve. I'm currently trying to use the latest version of Firefox (only recently installed), and whenever I click "preview post" on a new post I'm writing, the new tab that loads always comes up with a "page not found" error. I have confirmed that this is specific to Firefox, as there is no such problem when I attempted the same with Internet Explorer.
In order to help resolve the issue, I have:
a) Signed in and out;
b) Restarted the browser and computer;
c) Cleared my browsing history, including cookies and cache;
d) Turned 2-step authentication off;
e) Run Firefox with all add-ons disabled.
However, none of these has worked, and I'm not sure what to do next. It may also be worth observing that when the "preview post" page appears with "page not found", I get the pop-up in the bottom right of the screen inviting me to follow the blog - this would seem to indicate that it believes I am not signed in, but I of course have not signed out.
Although they may be unrelated, I have also had other browser compatibility issues, as whenever I click the orange + notification icon, the notification list never loads.
The blog I need help with is callumjhackett.com.