PM 31.1.0 under Xubuntu
When I login to the customer area of my electricy and gas supplier A2A this warning is generated silently on the console
I then enter username and password (sorry, this means you cannot reproduce this yourself). This flashes through one or two screens, then one gets to the main screen. This might or might not be preceded by a Pale Moon popup "To display this page Pale Moon must send information that will repeat any action ..." with two buttons "cancel" and "resend". If I do resend, or if no popup appears. I see the main part of the page greyed out, with a busy marker (an hexagon of six balls which move around) which seems to go on forever.
However since the top and side bar of the page are active (not greyed), I can click on any link, interrupt the busy marker and continue navigation.
This busy marker did not appear last time I went to the site (at the time I had a version earlier then 31), which I do not do very often. I am more inclined to blame a change in the site than PM 31.1.0 (which
solved several other places like e.g. flightradar)
I enclose below the console messages at this stage (the first should depend on the earlier warning, but the latter could be related to the busy loop
The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man. (G.B. Shaw)