How can I “hack” the Thunderbird Lightning extensi

Question

_{(Note: While I'm not entirely sure if this be better asked on SuperUser, I guess the fact that you probably will have to mess around in the xpi/jar file with the css settings, should make it suitable for SO.)}

Mozilla Thunderbird's Calendar extension, Lightning, will use different colors for different calendars, and just use a narrow vertical bar for the category color: (Light blue as calendar color and red as category color)

What I would like to find out is how I could go about changing/"hacking" the css styles that - surely - must be associated with this, buried somewhere in the plugin directory, so that in the example above, the event would be fully colored red.

Anyone know how to achieve this?

Answer 1

Thanks to speedballs answer I was able to locate the file that controls the Category Overlay: There is a PNG file under:

....\extensions\{e2fda1a4-762b-4020-b5ad-a41df1933103}\chrome\calendar.jar\
    skin\calendar\category-overlay.png

The width of this file is 7px, and enlarging it's width will enlarge the Category Color Overlay in the calendar view. (I just used GIMP to scale it horizontally.)

So it would appear that it is not possible to use the category to fully color the whole event, as it's color is only mapped in via a "hardwired" pixel-width of the overlay png.