Rated 5 out of 5 stars

@jeroen1978g, @patrick:

The changes should be applied to JavaScript file within ZIP archive of the add-on: color_folders-1.0-tb.xpi\chrome\colorfolders.js. Reinstall the plugin from the modified XPI file then.

My version of the add-on with the only mentioned change + updated manifest is shared here:

https://www.dropbox.com/s/8x4vectgzdkt0fq/color_folders-1.0.1-tb.xpi

Will be great if the author appears and consolidates the changes, many thanks to him for this useful add-on.

This review is for a previous version of the add-on (1.0).  This user has other reviews of this add-on.