Combining characters are not displayed properly
Fantastic extension, saves me from switching to KCharSelect all the time!
I like to use combining characters as math accents in programs that do not support LaTeX math. Unfortunately, these characters are not displayed properly in the drop-down menu. This view is from "Insert from Favorites":

They do show up properly in the "Manage Favorites" view:

This suggests the problem could be fixed by implementing #28, i.e. by having a view in the sidebar for both managing and inserting favorites.
This seems like a font issue; characters display for me (just very small):

These fonts are part of the window UI and cannot be changed via the settings. They are also dependent on the OS and which fonts are installed, so i doubt that i can do anything about this list.
I propose you add spaces ( ) before and after the character.
That is not a solution. It can lead to even more broken results if the browser does not have a way of combining those symbols:
