When displaying an HTML message, I can right click and the first three items allow me to zoom in, zoom out, or reset zoom to 100%. Is there any way to do this by keyboard? In many programs Ctl-+ and Ctl-- work for this. I run a KDE/Plasma system, so I don’t have any gnome utilities installed, but could probably install one if it would let me set the appropriate keyboard shortcuts.
Thanks for any suggestions.