the second suggestion by Cyclosaurus at
should rotate the whole page right enough, which may be enough for those weather images.
change 270 to 90 degress to suit
http://canisbos.com/quickstyle should let you rotate just specific elements on chosen websites
Andyball_uk thanks. The Cyclosaurus approach worked but I will need to generate a script to do it automatically. And that requires a little bit of study for me.
The Quickstyle approach was not helpful since there is no documentation or style for rotating the image that I could find.
Perhaps I should just go back to Chrome or Firefox and use the Alterna Tiff approach when I want to look at the marine weather charts.